> According to my own experience, this is not possible, due to > the fact that most mail servers do not strictly follow > standards when replying to SMTP request. > Some will reply that the user address is unknown, but some > will will not, simply accept the message and bye !
That alone doesn't mean they don't follow standards. For security reasons, it's common for SMTP servers to return a 252 response, which basically will not confirm nor deny the existence of the mailbox. That complies with RFC 2821. http://cr.yp.to/smtp/vrfy.html http://www.ietf.org/rfc/rfc2821.txt (7.3 VRFY, EXPN, and Security) Of course, you are correct that many servers probably don't strictly conform to the RFC anyway. Dave Watts, CTO, Fig Leaf Software http://www.figleaf.com/ Fig Leaf Software provides the highest caliber vendor-authorized instruction at our training centers in Washington DC, Atlanta, Chicago, Baltimore, Northern Virginia, or on-site at your location. Visit http://training.figleaf.com/ for more information! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Message: http://www.houseoffusion.com/lists.cfm/link=i:4:231601 Archives: http://www.houseoffusion.com/cf_lists/threads.cfm/4 Subscription: http://www.houseoffusion.com/lists.cfm/link=s:4 Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=11502.10531.4 Donations & Support: http://www.houseoffusion.com/tiny.cfm/54
