Stuart Henderson wrote:

quoted text
>

> I had a question off-list about how to do this, so I guess

> some other people will benefit from an example of how to set

> this up.

> 

If you are using postfix:
/etc/postfix/main.cf:

..

..

smtpd_recipient_restrictions =

         reject_non_fqdn_hostname

         reject_invalid_hostname

         reject_non_fqdn_sender

         reject_non_fqdn_recipient

         reject_unlisted_recipient	<-- this one

         reject_unlisted_sender

	reject_unknown_reverse_client_hostname

         warn_if_reject    reject_unknown_client_hostname

         reject_unknown_helo_hostname

         reject_unknown_sender_domain

         reject_unknown_recipient_domain

         permit_mynetworks

         reject_unauth_destination

	...

	...

	...

unknown_address_reject_code = 554

alias_maps = btree:$config_directory/aliases
/etc/postfix/aliases:

..

..

joe.bloggs	jb123456

joe		jb123456

bloggs		jb123456
$ sudo postfix reload