Send mail from site's IP and not server's IP

[jsmo]

On a server I run multiple websites, each with a dedicated IP address. When these domains send mail, mail is sent by the “server main IP address”.
Is it possible that this “main IP address” doesn’t show up, but that the domain’s IP address shows up, and only?

Moreover, some of the domains that send a lot of mails use a VPS as mail server. Each domain has its VPS. Server sends mail through SMTP to the VPS, that forwards the mails to recipients. The question above applies here too, I would like that VPS receives mails from the domain’s IP and not from the “server main IP”

Thank you!

[Ilia]

@jsmo

On a server I run multiple websites, each with a dedicated IP address. When these domains send mail, mail is sent by the “server main IP address”.
Is it possible that this “main IP address” doesn’t show up, but that the domain’s IP address shows up, and only?

Yes, check “Mail Options ⇾ Email Settings” page and its “Send outgoing email for domain from IP” option.