Plesk 11.x / Linux :: Slow SMTP Response From Qmail

Jun 16, 2015

We are seeing intermittent slow responses from SMTP on a RHEL6 server running Qmail on Plesk 11.5. The response is being measured from a remote Zabbix server.

The response time seems to be slow (>10s) for a period of 2-3 minutes and then returns to normal (<1s). All other services continue to be ok during the period of slowness.

The server_args line in /etc/xinetd.d/smtp_psa already contains "-Rt0" and all the DNS servers in /etc/resolv.conf are resolving properly.

From looking at the maillog file the server was receiving about 35 SMTP connections a minute at the time of the slowdown. We have the server configured to use 2 x RBL's.

I wonder if we are hitting a limit on the maximum amount of SMTP connections. The file /var/qmail/control/concurrencyincoming does not exist so, according to the Qmail manual, there shouldn't be a limit on the number of incoming SMTP connections.

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Qmail Slow Response

May 9, 2007

I have Qmail installed on my Centos box. There seems to be some problem with connection because when I run DNSreport from on it it shows me that it cannot connect to mailserver.

I tried telnet from local and this is what happened...

telnet 25
Connected to (XXX.XXX.XXX.XXX).
Escape character is '^]'.

then nothing happens for a while (about 30s)
and then I receive this greetings message:

220 [] ESMTP NO UCE/SPAM on this server ESMTP

How can I speed up this process? Are there any lookups possible or what?

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Plesk 11.x / Linux :: How To Add Additional SMTP Port To Qmail

May 13, 2014

I want to add a new port for SMTP (1024) as a client's ISP block 25, 587 and 2525. I tried following this guide: [URL] ... but it doesn't work with Parallels Plesk Panel 11.5 ...

How to add an additional SMTP port to Qmail in Plesk 11.5?

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Plesk 11.x / Linux :: Qmail Not Working - SMTP Isn't Responding

May 26, 2014

Just got a strange problem on my plesk server. (11.0.9)

Qmail isn't working...

In Home>Tools & Settings>Services management SMTP "Server (QMail)" is stoppped.

When I try to start it, it say "Information: Please allow for some time for the service to start." but never starts...

In command line i try to restart it with "service qmail restart" and it says "OK" also if i run "service qmail status" it says "qmail-send (pid 2880) is running..."

but, it really doesn't work... queue is getting bigger and smtp isnt responding...!

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Plesk 11.x / Linux :: SMTP Service (qmail) Stops Responding On Port 25

May 19, 2015

Since 15.05.2015 smtp experiencing problems.

Smtp service (qmail) stops responding on port 25:
# time telnet localhost 25
Connected to localhost.localdomain (
Escape character is '^]'.
Connection closed by foreign host.

real 4m10.629s
user 0m0.000s
sys 0m0.002s

After server restart or sometimes apache stop or ixnetd restart its responding for a some random time, and then again it stops to respond. Plesk panel show it as stopped but qmail itself running in memory, and does other its work, it just stops responding at port 25, or responds with a huge delay.

I've tried change it to postfix, reconfigured with mchk, repaired with -r, disabled and uninstalled parallels antivirus, antispam, dnsbl, disabled firewall, disabled smtp lock. Checked apache, dns. Enabled submission port which works when 25 port doesnt, but i need working 25 port.

Nothing solves problem, its just stops responding after some random time. There is no errors on maillog.

I think this problem occured after recent plesk microupdate, because i didn't do anything to server configuration in last months.

This article says it might be dnsbl [URL] .... but it disabled(from plesk panel) on my server, maybe there is way to focefully kill any relation to dnsbl?

Plesk info:
OS Red Hat Enterprise Linux Server 5.9 (Tikanga)
Panel version 11.5.30 Update #50, last updated at May 18, 2015 05:21 PM
The system is up-to-date; last checked at May 17, 2015 10:56 PM

update: xinetd restart is definitely brings smtp alive, but it goes off after random period of time (5min ~ couple hours)

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Godaddy Linux Server Response Very Slow

Jul 11, 2008

Godaddy linux server respons very slow

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Nov 6, 2008

I've been trying to get ahold of Awknet ( Sales sector for about a week now and still no response :-( Does anyone have similar experience? Or maybe Awknet just didn't get my email? :<

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Slow Response Time From Server ...

Jun 9, 2009

I have a dedicated server that I am renting that appears to randomly respond very slowly for some reason (pings are between 90-4000ms with about 75% packet loss).

This has been happening lately (about once a week for the past 4 weeks) and I thought I had originally found the cause of the problem but it appears I haven't.

Originally, when this problem was happening we were getting an abnormally high about of traffic but a reboot always fixed the issue. I've checked every where I can think of but I cannot find anything out of the ordinary.

ight now we're averaging less than 2Mbps in traffic, the CPU load is less than 0.75, the memory usage is at 55% with no swap being used, Apache connections are normal, no active SSH, FTP, or mail connections, I've restarted all services which had no impact, I've checked the access and error logs but can't see anything out of the ordinary.

I have a ticket open with the data center but I'm trying to figure this out on my own to fix whatever is causing this so I can move my data over to a new server we just got setup over the weekend in a local data center.

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Support Response Of Is Too Slow

May 13, 2008

10 days ago, I require assign another ip to my server.

Yestoday, I ask them again.

I hope donnot need another 10 days.

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Limestone - Extremely Slow Response

Dec 20, 2008

Limestone's support is extremely slow. I just got a server with them to host VPSes, so I was inquiring about additional IPs in case I needed them.

Their first two responses were within 4-5 hours, which is bearable. However, yesterday, I actually needed to order more IPs and posted a new reply. I have yet to receive a reply after over 12 hours and my client has been left waiting to receive the additional IPs he ordered.

I haven't been with Limestone long, and I haven't had much other experience with their support, but I was unsure what else to do other than post this here and hopefully get a resolution.

I know their servers are unmanaged and pretty cheap, but I think they should still take the time to answer tickets in a decent amount of time.

Has anyone had similar experiences with Limestone?

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Slow Server Response Time ....

Oct 6, 2008

I recently made a shift to FDC for one of my servers that I use for downloadable content.

I went for a $199 server with a 100mbps shared bandwidth port. Now, the only problem I seem to be having with it is that downloads appear to be, I would say recognized, very slowly by the server before they start, however, once the download starts I get a full speed. This usually happens during peak times.

I'm using about 10/15mbps on the server according to my cPanel statistics. I just wanted to ask here prior to contacting FDC on this, whether this slow server response time has something to do with the bandwidth port, or perhaps the server's RAM, CPU, etc? Given I'm using quite minimal bandwidth on the port, should I consider having them fix this or upgrade the server instead?

And if I had to upgrade, would I need to upgrade the port or the RAM, or both for this?

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DedicatedNOW / Fortress ITX - Blacklisted IPs, Slow Response

Jun 18, 2008

This is in regard to ongoing stress I've had over this server from DN...

Keep in mind this is a NEW server order; my first with this company.

I was assigned IPs that appear to be on multiple spam block lists. The "biggest" problems are mail being dumped to bulk by yahoo and dumped to bulk or completely black holed by hotmail. It was also blocked by comcast,, and anyone who uses SORBS (those are the only ones I KNOW about so far). This helps reinforce the suspicion that bulk mail was being delivered from the IPs at some point.

I Contacted support at 9PM on the 13th and was referred to abuse. Only after complaining again on the 17th, was I told they requested removal from ONE of the blacklists and they would "look into" the others. I replied saying I wanted new IPs or I would request a refund and that I did not feel the service I recently purchased was actually delivered.

Now here is the part that is giving me the feeling this will not end well for me; I no longer see the abuse department ticket when I log into their ticket system.

What If I ordered the server to use as a mail server? Am I out of line for finding a new server unable to deliver mail to the hotmail/yahoo inbox unacceptable?

Telling my customers to wait and maybe someday their mail will be delivered to the major free mail services is not the kind of reputation I want to have. Its feels like I was sold a problem someone else created and am expected to wait an unspecified amount of time to see if it can be resolved. I do not feel its fair to be left hanging while waiting for white listing attempts on IPs I did not soil in the first place.

I really hate bulk mailers and spammers. : /

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Qmail With External SMTP

Apr 27, 2008

I am using Qmail for most of my email accounts which is taking up a lot of my Singapore bandwidth which is extremely expensive. Anyway to configure such that POP goes to my Singapore servers, while I setup a pair of servers in USA for my SMTP needs?

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SMTP Response Times Spiking

Apr 25, 2009

About the middle of the month I started to get SMTP service down messages from a service monitor site I had signed up with. Initially I wasn't concerned but I started to get at least one notice a day. I decided to monitor the server a bit more closely so I setup a virtual appliance on my home server to monitor SMTP response times a bit more frequently -- I let the monitoring application run for a few days to gather data and noticed an unusual trend.

SMTP response times would spike dramatically during business hours -- up to almost 19 seconds at some times. However after business hours and on the weekends response times would return to normal.

My mail volume is really low for my VPS so I don't think it is the problem -- I even ran a mail stress test and pushed close to 500 messages through in 30 minutes (more than I normally get in a day) and I didn't see any SMTP response time spikes. I have also set up monitors to watch some other sites I have running on shared servers with other providers and do not see any unusual SMTP response issues with them at all.

system information is below:

Kernel Version: 2.6.18-028stab053.4
Hardware Information: VPS (1500MB RAM)
Exim Version: Exim version 4.69 #1 built 16-Mar-2009 16:41:00
Spamd Version: SpamAssassin Server version 3.2.4
running on Perl 5.8.8

Control Panel: CPANEL/WHM

top - 13:26:06 up 2 days, 19:23, 1 user, load average: 0.00, 0.00, 0.00
Tasks: 54 total, 2 running, 52 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 1572864k total, 206196k used, 1366668k free, 0k buffers
Swap: 0k total, 0k used, 0k free, 0k cached

1 root 15 0 1984 648 560 S 0 0.0 0:02.76 init
1590 nobody 16 0 61400 22m 10m S 0 1.5 0:07.71 httpd
1992 root 18 0 35112 31m 2196 S 0 2.1 0:15.58 spamd
7196 root 34 19 3744 1768 840 S 0 0.1 0:00.15 cpanellogd
7256 root 18 0 8464 5964 1772 S 0 0.4 0:31.80 tailwatchd
7292 root 18 0 5800 3776 936 S 0 0.2 0:00.00
7321 root 23 0 14684 7580 440 S 0 0.5 0:00.00 cpdavd
7427 root 15 0 15152 12m 1492 S 0 0.8 0:15.25 lfd
7491 nobody 15 0 62004 23m 11m S 0 1.5 0:04.87 httpd
7599 root 15 0 27388 24m 2168 S 0 1.6 0:05.53 spamd
7661 nobody 15 0 61776 23m 11m S 0 1.5 0:03.90 httpd
7907 nobody 18 0 61724 22m 10m S 0 1.5 0:04.60 httpd
9710 root 18 0 3212 1116 576 S 0 0.1 0:00.70 crond
12179 root 15 0 18348 8036 988 S 0 0.5 0:00.67 cpsrvd-ssl
13727 root 15 0 9924 2848 2296 R 0 0.2 0:00.03 sshd
16016 nobody 15 0 60652 21m 10m S 0 1.4 0:05.26 httpd
16017 nobody 15 0 61984 22m 10m S 0 1.4 0:07.89 httpd


vmstat 5 5

procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
r b swpd free buff cache si so bi bo in cs us sy id wa st
0 0 0 1367104 0 0 0 0 29 6 0 21 0 0 100 0 0
0 0 0 1366616 0 0 0 0 0 0 0 19066 0 0 100 0 0
0 0 0 1366284 0 0 0 0 0 0 0 25372 0 0 100 0 0
0 0 0 1366868 0 0 0 0 4 3 0 19395 0 0 100 0 0
0 0 0 1366904 0 0 0 0 0 0 0 19464 0 0 100 0 0


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Plesk 11.x / Linux :: How Qmail Is Configured

Jul 22, 2015

I am a new user of Plesk 11.5.30 struggling to understand how qmail is configured.

I intend to install ezmlm to work with qmail but the installation guide assumes that the qmail installation is set up per LWQ (Life with qmail - see URL....

For example the following are quotes from LWQ:All of qmail's system configuration files, with the exception of the .qmail files in ~alias, reside in /var/qmail/control.A series of configuration files resides under /var/qmail/users.

The qmail sendmail, which is normally in /var/qmail/bin/sendmail, usually replaces .None of these directories exist. So where are all these configuration entities?

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Oct 15, 2014

I have issue with qmail server. I want to update ssl certificate and for this i have replaced older servercert.pem with new servercert.pem file in /var / qmail/ control/. and restart service of qmail using qmailctl restart.But after updating this certificate my web browser still showing older certificate details.

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Apr 9, 2015

I'm using the API to dynamically create new subscriptions. However, I frequently never receive a response back for my request.

I have enabled graceful restart, which has made an improvement, but my requests still fail to return a response every now and then.

This is problematic, because the script needs to know whether the subscription has been successfully created or not. Often times, when the script times out, the subscription was successfully created. But Once and and a while that's not true, and it is causing inconsistencies in my system.

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Slow Page Response With Database Driven Site

Jan 24, 2007

I have built a database driven site with PHP & MySQL. Pages download quicker on some connections than other (obviously), however this is not due to connection speed. The web host server seems to respond very slowly to my boss's network (which is on a proxy server). Could it be that this problem is related to the web host? i.e. could it be that the web host is unequipped to deal quickly with this type of network?

On my home connection (2Mbps), pages often download instantly, however occaisionally I have to wait 10-20 seconds to receive the page from the host.

Finally, could you recommend an excellent web host to use with our site? My boss wants to offer a professional service where server response is quick. We are based in the UK.

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Qmail : SMTP Connection Error

Nov 15, 2007

I have a problem to send email using qmail to 1 company.

eg : to

The problem happen just when i send email to this companytwo only....

when i run this command to check

tail -f /var/log/qmail/send/current

i found this error appear 'Sorry,_I_wasn't_able_to_establish_an_SMTP_connection'

How to i fix this problem....

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Plesk 12.x / Linux :: Can't Switch From Qmail To Postfix

Jul 21, 2015

I am unable to switch from qmail to postfix via the control panel. It opens a new window that just hangs and never loads. While waiting for it to load, I see these 2 processes running..

root 25108 0.1 0.0 133972 20604 ? S 21:58 0:00 /var/cache/parallels_installer/parallels_installer_CentOS_6_x86_64 --service-mode=components --enable-xml-output --ssl-cert /usr/local/psa/admin/conf/httpsd.pem --branch release,stable --web-interface --with-ssl --disable-browser
root 25109 0.0 0.0 104952 3032 ? S 21:58 0:00 /var/cache/parallels_installer/parallels_installer_CentOS_6_x86_64 --service-mode=components --enable-xml-output --ssl-cert /usr/local/psa/admin/conf/httpsd.pem --branch release,stable --web-interface --with-ssl --disable-browser

But after waiting 20 minutes, the browser never loaded and the two proceses remain. So I killed both processes and removed /tmp/psa-installer.lock and started again. The same thing happened.

Is there a way to fix this? If not, is there an easy way to switch MTAs from the command line?

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Plesk 12.x / Linux :: Qmail Fails Due To Dh Key Length

Jul 11, 2015

I have been seeing these in my log and received complaints from customers not able to get their mail out. These messages just stay in the queue and go no where.

what they are successfully using as a tlsserverciphers and tlsclientciphers? Maybe it the dh key being too small. How can this be fixed on Qmail?

qmail: 1436646171.830486 delivery 6: deferral: TLS_connect_failed:_error:14082174:SSL_routines:SSL3_CHECK_CERT_AND_ALGORITHM:dh_key_too_small;_connected_to_170.49.86.238.

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Jan 22, 2014

I have Configured Apache2.4.4 for forward Proxy and tested from my browser the response is very slow and even not coming complete Response for some requests.

I also Tested the same for Apache2.2 Forward Proxy it is very fast and good.

May I know what is the Problem in Apache 2.4

Is there any Issues in proxy modules (mod_proxy,, in Apache2.4

This is the same configuration i used for Apache2.2 and Apache2.4

## Apache Forward proxy
<IfModule !proxy_module>
LoadModule proxy_module modules/

<IfModule !proxy_connect_module>
LoadModule proxy_connect_module modules/

[Code] ....

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Qmail Smtp Long Time Connection

Nov 8, 2007

I had Qmail installed and configure more than 2 years.

Last week, when I using Post Client (The Bat) try to send email, "Connection to Host" message shows Toooo long (aprox. 10 minutes)

POP3 connection working well.

OS RedHat Linux 2.4.25

[root@host smtp]# tail /var/log/qmail/smtp/current
@400000004733722622dcef34 tcpserver: status: 16/20
@400000004733722623095e34 -Table 'vpopmail.relay' doesn't exist-db_close() called!
@4000000047337226230be6a4 db_ping() is re-calling open_db!
@40000000473372262311f954 tcpserver: status: 17/20
@400000004733722623ad3b6c tcpserver: pid 6923 from
@400000004733722625a588fc -Table 'vpopmail.relay' doesn't exist-db_close() called!
@400000004733722625cf11cc db_ping() is re-calling open_db!
@400000004733722625fe863c tcpserver: pid 6926 from
@400000004733722d1b7434b4 tcpserver: end 6190 status 0
@400000004733722d1b744454 tcpserver: status: 16/20

and ps -aux return approx 10-15 lines with:
vpopmail 7330 0.0 0.1 2152 788 ? S 15:32 0:00 /usr/bin/tcpserver -v -R -S -p -x /etc/tcprules.d/tcp.smtp.cdb -c 20 -u 107 -g ...

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Plesk 12.x / Linux :: Postfix - Qmail Permission Denied

Feb 12, 2015

Mail isn't leaving the queue, it's returning this error

Feb 12 23:12:01 XXXX postfix-local[64360]: System error .qmail: Permission denied
Feb 12 23:12:01 XXXX postfix-local[64360]: Wrong permissions for .qmail

All the files within /var/qmail/ are set to the user and group "popuser", and have the nessacery rwx permissions for the user/group.

The OS is CentOS.

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Plesk 11.x / Linux :: Qmail And SSL For Specific Mail Domain

May 27, 2015

I'm using Plesk 11.5.50 CentOS 6.5 64bit with Qmail. I have installed a SSL certificate on mail server "" and is running successfully with smtp/pop3/imap4 daemon. Every user agent uses "" for smtp/pop3/imap4. The qmail name is "" (file me). The server has about 300 domains and 1000 accounts.

Now we want to add a new SSL certificate, called "mail.newcompany.tld", and use it only for certain domains. I would like to know if is possible to use the new SSL "mail.newcompany.tld" for a specific mail domain without using the old SSL "" that isn't expired yet. From Plesk Panel I haven't found a section for using the SSL for a specific mail domain.

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Plesk 11.x / Linux :: Qmail Email Messages Always In Queue

Nov 17, 2014

I have a server(godaddy) with plesk. It was all working well till 8 - 10 days ago. I didnt notice it one week later where I started receiving a lot of failed mail notices. Then on investigation, there were more then 50K spam mails in the mail queue and the mails that were supposed to be sent(registration, forgot password) were also held up in the queue. I found the source of the spam and fixed that.

Also I cleared the mail-queue. Now when I try to send out a test message, it still gets held up in the mail queue. But I can send a test mail to the same domain ( All new user registration mails are also held up and this is greatly affecting the site.

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Plesk 11.x / Linux :: Reinstall Qmail After Spam Attack

May 22, 2014

I need reinstall qmail after spam atack and follows the post.URL....It says:

rpm -Uvh --force psa-qmail

but my system return an error message..error: opening psa-qmail failed: it does not existe file or directory (error: la apertura de psa-qmail falló: No existe el fichero o el directorio)

rpm -q psa-qmail



And my system is CentOS

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Apr 21, 2008

Can i use Qmail or Sendmail or Postfix with WHM other than exim mail SMTP.

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May 9, 2014

I am running CentOS 5.10 (Final) with Plesk 11.5.30 Update #44 and since a few days have the strangest problem with incoming emails from certain hosts.

The email from known senders produces a relaylock message like:

/var/qmail/bin/relaylock [12345]: mail from (

From what I was able to gather this is regular behaviour with plesk and qmail, indicating that the senders' mailserver has made contact.

Then nothing happens. For hours. 7-10 to be exact. Then the mail is being processed and delivered.

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Sep 15, 2014

We installed a new VPS with Centos and Plesk 12.

Domains are simply not showing in the controlpanel. We can see the subscriptions but its empty under the button 'Domains'. Newly created sites as well as migrated sites do not show.

Before we created or migrated a site to the server we changed psa.conf HTTPD_VHOSTS_D /home/httpd/vhosts
This is a legacy from our old servers and never has been a problem. I suppose this is not related, but just thought I should mention it.

The second problem with this server is that when we toggle the mailservice in 'Services management' the button reacts but does not change the state of qmail. It just keeps running. What can be wrong with this fresh installation?

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