Sorry for the repost, but in the other thread i didn't get any answer. I hope i'll be more luckier here After i update my ISPC to latest 18.104.22.168p1 version (on CentOS 6.4, following the Perfect Server Guide with Apache, Postfix and Dovecot), i can't send email with phpmail function. So my WP websites and our custom web application can't work well :/ The issue is strange, because it seems i can send simple emails but no email with any attachment (i.e.: a db backup created with BackWPUp WP plugin, or a simple email with a text file attachment we create in the custom web portal) Pls look the /var/log/maillog: The first bold line: seems the site is trying to send as [email protected] but the address set in WP is another ([email protected]). Instead, [email protected] is set as forward email in ISPC Second to fourth bold lines: what is meaning?