On Mon, Aug 22, 2011 at 8:07 AM, Barry Brimer <lists at brimer.org> wrote: >> <anne at xxxx.org>: host mailhost.zen.co.uk[212.23.3.98] said: 550-Verification >> failed for <anne at xxx.lan> 550-Unrouteable address 550 Envelope Sender: >> Domain must resolve in DNS! (in reply to RCPT TO command) > > It looks like your outgoing mail from your local user(s) needs to be > masqueraded or the whole server does. I think Barry has it right here. Also, if you're using postfix, you should "yum remove sendmail" to avoid any possible conflicts. There's no reason to have sendmail, postfix implements its own 'sendmail' command. -☙ Brian Mathis ❧-