in reply to •Re^5: Please evaluate: RegEx for validating e-mail addresses
in thread Please evaluate: RegEx for validating e-mail addresses
When the problem was with a modern system, it was almost always do to administrative modification to prevent anti-impersonation and open-relay. Since I can't give specific examples of MTAs that do not accept RFC compliant email addresses, http://www.rfc-ignorant.org/ is a site dedicated to listing domains that don't think the rules of the internet apply to them (postmaster, DSN, etc).
Finally, it is arguable that I am using MTA (Message Transfer Agent) too liberally. For instance in the case of CC:Mail and GroupWise, the internal mail system was not native SMTP and so the gateway/MTA had to additionally translate the incoming address to the native format. Or perhaps if the MTA is only accepting mail for a specific domain which happens to be a specific mail system - than it is not a true MTA. I will not argue except to say my original point was referring to specific situations. Admittedly, I should have been clear:
Cheers - L~R