- Plesk Onyx for Linux
It is impossible to delete the IP address via Tools & Settings > IP Addresses > 203.0.113.2 > Remove:
PLESK_ERROR: Error: The IP address
203.0.113.2is already used for hosting.
There are no domains assigned to this IP address;
Previously, there were domains on this IP address, but they were switched to Forwarding or No Hosting hosting type in Domains > example.com > Hosting Settings;
In Tools & Settings > Mail Server Settings > Outgoing mail mode is set to Send from domain IP addresses.
It is a Plesk bug #PPPM-8945 which is going to be fixed in the future updates.
Until a fix becomes available, use the following commands to switch mail to another IP address:
Connect to the server via SSH;
Execute the following command for the affected domains:
# plesk bin subscription -u example.com -ip 203.0.113.2 -mail-service-ip 203.0.113.3