in reply to Re^4: Practical e-mail address validation (flexes)
in thread Practical e-mail address validation

They (email addresses with periods immediately preceding the @) were also very common by Microsoft Exchange back when I was working at the DoJ. I am not sure if M$ has become more compliant. I am going to be updating this node with a variety of other ways at attempting to exploit open relays and I will /msg you when complete.

Update: Rather than enumerate them myself, go to 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 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" 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