Changing the Outgoing Mail IP Address in Plesk on Linux

Sending email can occasionally become difficult because the outgoing mail IP address has been blacklisted. To get past this, you first need to stop the spam being sent and, if the IP address cannot be removed from the blacklist, change the outgoing mail IP.

This article shows how to change the outgoing mail IP in Plesk running on Linux.

To change the outgoing mail IP, you need to be using Postfix as the mail service, and the server must already have more than one IP address added and set as shared.

You can choose the mode you want under Tools & Settings -> Mail Server Settings -> Outgoing Mail Mode.

Send from domain IP addresses

With this option, each domain sends from the IP address assigned to it. When the domain's IP address changes, the outgoing mail IP changes too. If several domains share a single IP address, all of them send from that address.

Send from domain IP addresses and use domain names in SMTP greeting

The same as above, except that the sending domain is shown in the SMTP greeting. When several domains send from the same IP address, messages are more likely to end up in spam. This option also causes high resource usage when 100 or more domains are hosted. Although it is not mandatory, having a separate IP address for each domain, with PTR records set for those addresses, will make the system work more reliably with this option.

Send from the specified IP addresses

All domains send mail from the specified IP address, whether or not they have a dedicated IP address.

After you make your choice and save, Plesk applies the necessary changes in the background and your outgoing mail IP address is changed.