I think that I found a clue. So one important detail about this issue:
Server is configured with 2 interfaces eth0 (IP 1.1.1.1) and eth0:0 (IP failover as alias, 2.2.2.2)
Domain use the IP address eth0:0 so 2.2.2.2
So when I'm trying to use the two first options, mails are sent from 1.1.1.1 address instead of 2.2.2.2 (domain ip address) as expected.
Mickael.
I can confirm this. Plesk 12 on CentOS 7.1. On 8 servers the same behavior and still not fixed.
regards,