hright

Hi @satollo,

Good day! Thank you for your information.
Actually after checking, the mail module still using wp_mail() to send mail, and I’m also manage the mail services and I’m ensure there is no MTA logs showing in our mail system. (But when telnet from wordpress server to relay is working fine), is there any further suggestion on it?
(btw, I found one article said need to install stmp module, is it correct?)