postsrsd changing From: header in body about postsrsd HOT 7 CLOSED

postfix sender_canonical_classes option is your friend. Actually if you stick to the postsrsd recommended settings (see README) then this should not happen.

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I have set sender_canonical_classes to "envelope_sender" as described in the README. It is my understanding that this setting should imply that only envelope header (i.e. MAIL FROM:, RCTP TO: etc.) will be replaced and header_sender (From:, To: in MIME body) will not be replaced. But still I see this issue. I am running postfix 2.11.0 on Ubuntu.

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What do the logs say?

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I have sender_canonical_classes properly configured. I can produce this problem in the following way:
with the configuration as the README suggests, send an email with no From: header in it, and set your envelope information to a domain handled as a virtual_alias_domains (i.e., not the primary domain of the mail server).

I find that the SRS-formatted envelope sender in this case ends up in the From:

I suppose this can't be prevented, and really you should be submitting outgoing mail with a From: header in place, but I've been unable to find the setting in Postfix which decides what to add into the From, but whatever it is, it's using the SRS rewritten information when postsrsd is activated, and DTRT (uses [email protected]) when postsrsd is deactivated.

If this is a bug, I think the primary needed action is to add an explanation of how to handle virtual_alias_domains and empty From: headers in the docs.

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The missing header is added by the Postfix cleanup daemon (see the manual page), after it has consulted the canonical_* maps, that's why the rewritten address ends up in the From: header.

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The correct solution is to always set the "From:"-header, but sometimes it's not possible to control that, and using SRS-remapping just makes things worse. One such example are mails sent from Ubuntu's unattended upgrades system. A possible workaround is to use Postfix's header checks:

/etc/postfix/main.cf:
    smtp_header_checks = pcre:/etc/postfix/header_checks

/etc/postfix/header_checks:
    /^From:[[:space:]]*SRS0[[:print:]]*=([[:print:]]+?)=([[:print:]]+?)@[[:print:]]*?[[:space:]]*$/ REPLACE From: ${2}@${1}

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Closing this issue, since it seems to be stale. Feel free to reopen.

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