So after many helpful responses (thank you everyone), it sounds like I should change how I use the access file to something like: mydomain.com REJECT validuser1@xxxxxxxxxxxx OK validuser2@xxxxxxxxxxxx OK validalias1@xxxxxxxxxxxx OK This will supposedly reject any email address (account and/or alia) that I don't explicitly list as OK. However, the following excerpt from /etc/mail/sendmail.mc seems to say that the way I'm using it is the correct way and this modification wasn't the original intention: dnl # With blacklist_recipients you can add entries to the map (access file) for local users, hosts dnl # in your domains, or addresses in your domain which should not receive mail dnl # for example: oldemployee@xxxxxxxxxxxx ERROR:550 Mailbox disabled for this username FEATURE(`blacklist_recipients')dnl This makes me nervous. Any comments? Again, I'm not using the virtual users, it is the only server for the domain, I only have one domain, and the server has all the accounts in it.
