in reply to Re^4: Practical e-mail address validation (flexes)
in thread Practical e-mail address validation
Update: Rather than enumerate them myself, go to http://www.abuse.net/relay.html and test an MTA you believe to be secure. It shows you all the email addresses it uses to test with (from and to). I also realized I had the relay syntax wrong. It is firstname.lastname@example.org. I have updated the prior node.
Update: I haven't provided a complete list of "rules" that I think such a theoretical module should include but having "John Smith"@example.com is another one that should be flexible. If I come up with more I will add them here but it has been a long time since I thought about such things. Oh, and I used to have to worry about non-SMTP addresses too like CC:Mail and GroupWise (fortunately not UUCP).
Cheers - L~R