Email From A Single Domain (university) Not Being Received At VPS/Cpanel

May 16, 2008

I have a problem where all email sent from uaccb.edu (studentmail.uaccb.edu [208.190.226.130]} is not arriving at my VPS. The people sending email from the above domain are not getting any errors, it is not being marked as spam, it is just being blackholed somehow.

I have checked the above IP and domain, and can't find it on any blacklist, and I am using pretty standard cPanel setup on my VPS. I have spam set to be marked and receive a fair amount and have it autorouted to a folder rather than auto-deleted.

From uaccb.edu, the only thing I have access to is Outlook Web Access to send test emails, and they are sent fine with no errors returned. If I send test emails to gmail and other similar email accounts, they go through fine, the only problem is to ANY domain hosted on my VPS. I have even recently transferred all the domains to a second VPS (with the same hosting company) at a different datacenter (for different reason) and the problem persists.

Is there any WHM setting or any ideas on how to troubleshoot this?

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Jul 3, 2014

Outlook 2013 complains about the SSL certificate when using email. Installing the certificate still doesn't stop the error/warning. What are my options?

Can I install on the plesk server a self-signed SSL cert and avoid the issues?
Can I buy & install a single certificate for that one domain and resolve the issue but not affect others.
Do I need to buy a SAN certificate for the whole server?

BTW I'm running CentOS 6.5 and Plesk 12.

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I have a detected server and it host one domain with many sub domains account. I never used the cpanel DNS service, instead I used the hosting company’s DNS. .Everything was working fine (including the email) until I decided to have my own DNS. I used the domain register company DNS service to create a DNS records for the domain and all my sub-domains. The problem is the email did not work yet!! Here what I done with the DNS :

eg.com my domain and 1.1.1.1 the server IP address (e.g.)
Type--- Name ---- Domain -- Data ---Pref
A---- ---- eg.com ---- 1.1.1.1
A---- *. ---- eg.com ---- 1.1.1.1
A---- forum. ---- eg.com ---- 1.1.1.1
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MX---- ---- eg.com ---- 1.1.1.1----0
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I update the nameserver in the cpanel basic setup. It should work fine, I don’t know what goes wrong? I never touch the server configuration, the server was relay on external DNS service.

Here are the error that I got when I tried to send an email to the server :

info@eg.com
SMTP error from remote mail server after RCPT TO::
host mail.eg.com [1.1.1.1]:
550-Verification failed for ....

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I would probably want to setup SSH Tunneling but dont know the commands. I have found tutorials for linux local to linux remote but I have got windows and havent found any tutorials for windows to linux tunneling.

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i tried adding an entry in /etc/security/limits.conf which restricts numproc to 2 and then down to 1, but it doens't seem to make any impact on the load. load of the server drops from about 1.5-2 down to 0.02 when this single site is suspended, and i can't have it run wild.

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I have one valid commercial Comodo certificate. It is correctly installed and works fine on my 443 port when I go to https://www.domain1.com

However, I have quite a few other virtual hosts that also work fine on my port 80 when I go to http://www.domain2.com then http://www.domain3.com and so on.

Now out of curiosity I have typed https://www.domain2.com and it picked up the SSL certificate from my first domain1.com when it wasn't supposed to (I guess)! It reported an error but worked! Then I tried all my other domains 3,4,5 and so on and the issue repeated.

How do I keep this single certificate to the only domain name it belongs to? It has no wild cards and is valid for only one domain name I bought it for. The example of my hosts' configuration is below:

<VirtualHost *:80>
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[code]...

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Aug 11, 2014

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From the documentation, [URL] ...., it appears that if the user is using a SNI compatible browser a single SSL certificate for sub.mysite.com should work (as I am using a linux server, SNI is enabled by default I believe).

However, the control panel for the domain (website & domains > hosting settings) states that "To employ SSL, move this site to a dedicated IP address, install an SSL certificate on the site, and then select it below." In addition, other documentation makes reference to a "Secure your sites" link on the control panel to implement a purchased SSL certificate, which is not visible to me - I presume because the domain is not on a dedicated ip address.

Can someone confirm that;
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One alternative may be to purchase a wildcard SSL certificate (*.mysite.com). This post [URL] .... suggests that this would work. However, this is a more costly option and does more that I need (i.e. delivers SSL for all domains).

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I know that there must be a host out there who is willing to let me do it, I just need to find it...

BTW, the list is scrubbed, and I will make every attempt to keep the IP's 100% clean, as I have a vested interest in making sure that my deliverability is high, so it's not like I'm going to "spam and run"...

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Archiver error: from /private-backup/plesk/clients/WSKunde/domains/domainname.de/backup_domainname.de_conf_1506200200.tgz:
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[Code] ....

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Now from what ive experienced i should be able to use and setup email accounts from within cPanel from both domains.

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The previous domain already has email accounts setup, if i make the switch and make it a parked domain onto the new primary domain will i still be able to retain the same email accounts/passwords/email?

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