SSL - SMTP/IMAP - How to certificate?
Question asked by Knud Westdorf - 9/22/2017 at 6:30 AM
Hello guys 
I have read the article about "SSL" on SmarterMail.
I have a question that I hope you can help with.
What certificate do I need? I use DigiCert normally. 1 certificate for the mailserver, that holds every domains? 
We would like to offer our customers SSL encryption on SMTP / IMAP. We have about 550 customers/domains on our Smartermail 16.x shared mailserver. 
I have read the following guide:
Hope you can help me. Thanks.

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Brian Tesene Replied
We use a standard 2048bit, single domain SSL certificate. Instead of each customer/domain connecting with their own mailhost name, they now connect through that one domain name. So, for, example, if your company name were "", you could purchase a cert for All customers would access webmail through and they would use as their incoming and outgoing mail servers (with the appropriate secure ports) when using a mail client.

The setup is very easy. You do the standard SSL install in IIS to secure the webmail and then you export the certificate (as described in the SM documentation) to secure the pop, imap, and smtp connections.

I hope this helps.

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