Resolving MS15-055 on cPanel Servers

If you’re a hosting provider with cPanel servers that were set up prior to version 11.46, you may be hearing from customers using Outlook ever since MS15-055 was released by Microsoft on May 12.  This most recent Outlook upgrade prevents the software from connecting to a POP or IMAP server that uses DH keys that are…

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Configure Email Client Shows Wrong SSL Hostname

CPanel allows you to install a shared SSL certificate for email services so your users can connect securely to POP, IMAP, and SMTP.  The only real drawback here is that you can only natively use one certificate, which means your users should be connecting to the correct hostname under which the SSL certification is installed from…

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Implementing Mandrill with Exim on cPanel

Mandrill is a transactional email service run by MailChimp, comparable to SendGrid.  It comes stock with a powerful API for fast implementation into applications for sending email reliably over SMTP, but it can also be used as a smart host for all of your server’s outgoing email. The below instructions cover how to do this…

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Implementing SendGrid with Exim on cPanel

Setting up your cPanel server to send through a third-party mail server is very easy to do, if you understand the basics of how cPanel builds its Exim configs. You never want to edit your exim.conf file directly – your changes will be wiped out any time a cPanel update runs or someone makes a…

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Exim Privilege Escalation in 4.69-23

The cPanel security team found an issue in Exim that can potentially allow a user on the system to potentially run commands as the root user. Luckily, cPanel has already released a patch which is available for immediate download via their Exim upgrade script. If your system is set to update cPanel automatically, you may…

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Using Custom RBL’s with Exim and cPanel

cPanel 11.28 introduces an way to easily implement your own RBLs for Exim to perform lookups against.  To get started, log into WHM > Exim Configuration Editor and click on the RBLs tab, then Manage custom RBLs. From here, enter in the information for your RBL as follows: The DNS list would be the hostname…

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10 Tips for Improving Email Delivery

One of the most common problems that hosting providers face is the issue of user email not being delivered to other mail servers. Not only does it annoy the end user, but it’s extremely frustrating for the server administrator to deal with since there’s not always a clear indication of why email doesn’t get delivered…

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