Qmail : SMTP Connection Error

Nov 15, 2007

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

eg : mail@mycompany.com to mail@companytwo.com

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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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 76.65.180.227
@400000004733722625a588fc -Table 'vpopmail.relay' doesn't exist-db_close() called!
@400000004733722625cf11cc db_ping() is re-calling open_db!
@400000004733722625fe863c tcpserver: pid 6926 from 76.65.180.227
@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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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.

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

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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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Since 15.05.2015 smtp experiencing problems.

Smtp service (qmail) stops responding on port 25:
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Trying 127.0.0.1...
quit
quit
Connected to localhost.localdomain (127.0.0.1).
Escape character is '^]'.
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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.

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Plesk info:
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Panel version 11.5.30 Update #50, last updated at May 18, 2015 05:21 PM
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==============================
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