Setup ISPconfig straight from tutorial below. Email seemed to be working great. Now it isn't. https://www.howtoforge.com/tutorial...l-pureftpd-bind-postfix-doveot-and-ispconfig/ It will send email from from roundcoude, but not from a client (i,e Thunderbird, etc) Here is the error from the mail.log relay=127.0.0.1[127.0.0.1]:10026, delay=0.33, delays=0.1/0.02/0/0.22, dsn=4.5.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.5.0 id=01623-11 - Temporary MTA failure on relaying, From MTA() during fwd-connect (All attempts (1) failed connecting to smtp:[127.0.0.1]:10027):