[IMail Forum] Conditional SMTP auth

[Gabe Sponsler]

Hello everyone,       I have a question about SMTP auth.  Is their a way to utilize SMTP auth for sending mail conditionally, like:          If you a user attempts to use the SMTP server Imail first checks relay mail for addresses and if the IP is not include in that list it gives the auth challenge.       I am introducing many new users to our server  (enough IP blocks that it would be absurd to relay for all of them) but I am trying to avoid having to go back to my current customer base and reconfigure everyone's mail client with a outgoing user/pass.         If anyone has any thoughts on my predicament I would appreciate insight,       Thanks,     Gabe