Postfix, bounce per-RCPT based on mail content

in flag

With Postfix, is it possible to manually or otherwise bounce messages per-RCPT based on the mail content body (e.g. RFC5322.From headers).

For example,

  1. Mail with 5 RCPT TO envelope headers is queued
  2. Mail enters advanced after-queue content filter
  3. The filter examines the full mail object, and determines 2/5 of the RCPT should be bounced
  4. Mail is forwarded to the other 3 RCPT as normal.
  5. Send a nondelivery notice for the other 2 RCPT.
anx avatar
fr flag
If the filtering is just a simple check for headers, you should prefer *before-queue* processing, with the added bonus of letting the sender decide what to do about partially accepted recipient lists (instead of asynchronous notifications). Beware of the `SMFIP_RCPT_REJ`-opt-in in that case.

Post an answer

Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.