On Mon, Aug 22, 2011 at 01:12:54PM +0100, Always Learning wrote:
On Mon, 2011-08-22 at 13:07 +0100, Anne Wilson wrote:
anne@xxxx.org: host mailhost.zen.co.uk[212.23.3.98] said: 550-Verification failed for anne@xxx.lan 550-Unrouteable address 550 Envelope Sender: Domain must resolve in DNS! (in reply to RCPT TO command)
Once your email is out on the Internet is needs a genuine Internet email address. xxx.lan is known only to your internal system and it is not an Internet email address.
Care to show the headers of your outgoing email ? (cover-up the bits you want to keep private)
If you're running postfix, you might want to also edit /etc/aliases. The last line or so has a commented line, person who should get root's mail. (The name is marc, probably the person who first wrote it.)
After changing that, run newaliases /etc/alias to rebuild the /etc/alias.db.
To answer your other question, alternatives is the command you asked about in an earlier post
alternatives --config mta
This will show you if you're using postfix or sendmail.