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We are currently running a root server with Debian 6 and Plesk 10.4.4. We have some virtual hosts using one IP adress (shared) - e.g. - and another virtual host using a dedicated IP address (

Is there a way to configure postfix to do the following

  1. Always use the IP address of the virtual host to which the e-mail account belongs (so that an e-mail from will originate from the shared IP-Address and an e-mail from will originate from the dedicated IP?
  2. Use different certificates for TLS for and

If the latter is not possible: Could any problems arrive when using as certificate for users? Of course, users would have to configure their clients to use as the SMTP server name to avoid annoying security warnings. But if we still would be able to get the effect of the first point that would still be acceptable.

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closed as off-topic by HopelessN00b Mar 3 '15 at 7:05

  • This question does not appear to be about server, networking, or related infrastructure administration within the scope defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.

No, you are not running "root server". Well, I hope so. (lmgtfy, see first result) – user130370 Oct 1 '12 at 8:32

As of #1 - this should be default behavior of Plesk if you are on Postfix mail server:

[+] (Only for Linux) Outgoing e-mails from a customer's exclusive IP. Outgoing e-mails are sent from a dedicated IP address owned by a customer, thus reducing the risk of blacklisting the whole server for spam. Subscriptions hosted on a single shared IP address will use this shared address for outgoing e-mail (instead of using the IP address occupied by Panel). The feature requires Postfix 2.7+ and is supported on the following operating systems:...

see more here

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Thank you. I've noticed that, too. – JulianB Oct 18 '12 at 16:16

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