Hello. I'm using ISPConfig on FC4 (as a vm via xen). I have followed the Perfect Setup and all has worked fine e.g. web, sql, DNS etc My users are able to login to POP mail OK too. I have still a problem with Postfix. When I send an email to [email protected] to SMTP://mail.myserver.com postfix gives an error. Dec 21 08:36:11 ns1 postfix/smtp: 5846A257AF: to=<[email protected][email protected] my server is ns1.networkassociations.org.uk my server is on 126.96.36.199 my virtual domain is westhampstead.me.uk my virtual server is on 188.8.131.52 Is this due to reverse DNS lookups? (I can post much config / setup files if needed) does anyone have some pointers for further investigation for me?