On Tue, 21 Feb 2012 13:38:04 -0800 (PST) Chris Flav <[email protected]> wrote:
> Indeed the point of using MIMEdefang is the possibility to reject a > email during the SMTP transaction, instead of accepting the email to > only silently delete it later. If different recipients have different policies, it's extremely difficult to do that. The SMTP protocol simply doesn't lend itself to that. The only way to (1) apply different policies to different recipients, (2) reject during the SMTP session and (3) not generate backscatter is to group your recipients into policy-classes. You need to accept RCPT To: commands for the first recipient and all recipients in the same policy class and tempfail all other RCPT To: commands. Then you process the mail. In theory, the sender keeps trying the tempfailed recipients until all policy classes have been processed. In practice, this makes senders angry and introduces a lot of delays. We've agonized over this with our commercial products and have decided that sometimes silently discarding a message is the only viable option. Regards, David. _______________________________________________ NOTE: If there is a disclaimer or other legal boilerplate in the above message, it is NULL AND VOID. You may ignore it. Visit http://www.mimedefang.org and http://www.roaringpenguin.com MIMEDefang mailing list [email protected] http://lists.roaringpenguin.com/mailman/listinfo/mimedefang
