At 02:03 11/11/2004, S=F6nke Ruempler wrote: >[EMAIL PROTECTED] wrote on Wednesday, November 10, 2004 4:01 =3D >PM: > > > Why are you accepting, then bouncing, mail? In today's > > climate of widely=3D3D20 > > forged envelope senders, it doesn't make sense to accept then bounce > > - as=3D3D20 much as possible, things should be rejected during the > > protocol session=3D3D20 > > with a SMTP error.=3D3D20 > >Because Xmail should forward this message.
Forwarding is always a problem, but there are ways to handle it (depending= =20 on the type of forwarding you're doing). Myself, if I'm forwarding all mail for a domain, I request a list of all=20 valid users / aliases for the domain, so I can do local validity checking=20 before accepting a message for forwarding (in essence, setting up a local=20 domain to verify the mail, then using mailprocs to forward the message on=20 to the intended server). However it would also be possible to set up a pre-data filter to make a=20 connection to the destination server and test that the message is addresed= =20 to a valid recipient. Of course, there are other reasons for rejecting a message, such as viruses= =20 or spam content - but since both of those are typically forged, it makes=20 sense to dump those rather than bouncing them. If you're worried about=20 false positives in this sense, perhaps a short note to the intended=20 recipient saying "We quarantined a suspect email from <address> due to=20 <reason>. If you wish to look at this message, please <take particular=20 action to cause mail to be delivered or viewed from web mail>". I'm sure there are other ways, as well - these are just two that I'm=20 familiar with. But (in my opinion, of course) sending NDNs for anything these days is=20 really not the best idea. There is way too much forgery going on for NDNs=20 to be even close to reliable - and there are a lot of domains out there who= =20 are doing "block on sight" of NDNs to forged senders.=20 - To unsubscribe from this list: send the line "unsubscribe xmail" in the body of a message to [EMAIL PROTECTED] For general help: send the line "help" in the body of a message to [EMAIL PROTECTED]
