Hi I think you should take a serious look at SRS, such that bounces get back to your system instead of the original sending server. And yes, exim can do RCPT-TO-verification, look out for "callout"s in the manual.
Regards, Steffen > -----Ursprüngliche Nachricht----- > Von: exim-users-boun...@exim.org [mailto:exim-users- > boun...@exim.org] Im Auftrag von John Traweek > Gesendet: Montag, 9. Mai 2011 13:59 > An: exim-users@exim.org > Betreff: [exim] Virtual Forward To's Eliminate NDR's > > We allow our customers to set up vanity email addresses, which we market > as email for life accounts. The accounts are strictly forwarding accounts, so > there is not a "mailbox" so to speak. Mail comes in, and is forwarded on to a > permanent account. So for example, a customer may wish to have an > account us...@vanitydomain.com forward to us...@aol.com. > If two years from now, the customer changes ISP's from AOL to a Yahoo > account, he or she would simply access our system and change the forward > to us...@yahoo.com. > > We have had this product in place for about ten years using a multitude of > systems, including Barracuda gateways, a group of load balanced servers to > perform the forwarding mechanism and another group of servers to perform > the outbound delivery. > > I am looking at moving everything to a couple of servers running Exim4, > SpamAssassin, ClamAV, and MySQL using virtual users. I am an exim newbie > and Linux newbie, but have managed to get a test box set up on Ubuntu 8.04 > LTS and everything seems to be running great. > > One of the problems we have with our old setup is that people will let their > forward to address go bad and never update it. So when the message finally > gets to the outbound MTA's destined to one of these bad forward to's an > NDR is generated and sent back to the sender. Not so good... It's a perfect > back spattering spam machine. > > One of the nice things I have noticed about Exim is that out of the box with > the way I have it set up it will verify the forward to domain. So for example, I > have virtualu...@vanitydomain.com forwarding to u...@baddomain.com. > During the initial receiving transaction Exim will verify baddomain.com. If it > doesn't exist it will 550 the transaction and no NDR from my server. Great! > > So my question is can it also verify the RCPT TO of the forwarding address > during the original transaction as well? This would issue a transaction > response back to the connecting MTA, thus preventing further > NDRs being generated? > > If this is possible, what will happen with non permanent failures, such as > 400's, ie mail box full etc? Will those be issued back to the originator during > the transaction, so the responsibility is put back on the originating MTA to > retry the transmission? > > TIA > > > > ________________________________ > > > John Traweek > Executive Director, Information Technology Proud PCI Associate for 14 years > PCI: the data company > Heritage Square > 4835 LBJ Freeway, Suite 1100 > Dallas, TX 75244 > 214.530.0394 > We drive engagement. We accelerate contributions. > > This Email is covered by the Electronic Communications Privacy Act, 18 U.S.C. > Sections 2510-2521 and is legally privileged. The information contained in this > Email is intended only for . If the reader of this message is not the intended > recipient, you are hereby notified that any dissemination, distributions or > copying of this communication is strictly prohibited. If you have received this > communication in error, please notify us by telephone 1.800.395.4724 X160, > and destroy the original message. > > -- > ## List details at https://lists.exim.org/mailman/listinfo/exim-users > ## Exim details at http://www.exim.org/ > ## Please use the Wiki with this list - http://wiki.exim.org/
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