Okay, I haven't tried adding a mail account in several months but now it seems broken... Mobile@domain.tld should be working just fine. I can login to the account via POP3 and send email with the account login information via SMTP. However, any mail sent from other email accounts to that account isn't being delivered and is always returned. /var/log/maillog Nov 14 02:44:55 its pop3-login: Disconnected [::ffff:18.104.22.168] Nov 14 02:45:17 its pop3-login: Login: web3_mobile [::ffff:22.214.171.124] Nov 14 02:45:49 its postfix/smtpd: connect from mailhost.domain2.tld[126.96.36.199] $pient table; from=<email@example.com> to=<firstname.lastname@example.org> proto=ESMTP helo=<mailhost.domain2.tld> Nov 14 02:45:50 its postfix/smtpd: disconnect from mailhost.domain2.tld[188.8.131.52] Nov 14 02:46:06 its pop3-login: Login: web3_mobile [::ffff:184.108.40.206] Nov 14 02:46:37 its pop3-login: Login: web3_derek [::ffff:220.127.116.11] /var/mail/ -rw------- 1 web3_mobile mail 0 Nov 14 02:41 web3_mobile -rw------- 1 web3_webmaster mail 14K May 9 2007 web3_webmaster The ISPConfig administration page shows it setup as: web3_mobile mobile mobile 0 0 There is a 20MB web space and 20MB mail allocation. I had spam filtering on DENY but later turned all of those filters off just in case. Email sent from one of the POSTMAILER FAILURES: Hi. This is the qmail-send program at yahoo.com. I'm afraid I wasn't able to deliver your message to the following addresses. This is a permanent error; I've given up. Sorry it didn't work out. <email@example.com>: 207.150.163.xxx does not like recipient. Remote host said: 550 <firstname.lastname@example.org>: Recipient address rejected: User unknown in local recipient table Giving up on 207.150.163.xxx. Any help would greatly be appreciated! I did reboot the box and all of the daemons many times... Thanks.