On Tue, Nov 28, 2023 at 10:04:53PM -0500, John Levine via Postfix-users wrote:
> If a malformed mail message shows up by SMTP (not local sendmail or
> submission), will postfix generally try to clean it up or just
> pass it along?
You have to be a bit more specific. What does "malformed" mean?
Generally speaking, Postfix leaves messages alone, other than folding
very long lines when forwarding to a remote SMTP server.
Postfix will however insert a blank line after the last header and
before the first body line if there isn't one. This can happen
when there's a malformed header (missing a ":" or the header name
is too far out of spec).
> I see the cleanup program and all the options about when to run it and
> what to tell it to do, but in practice, will a typical system clean
> everything up, just locally submitted stuff, or soemthing else? TNx.
The cleanup service is not about fixing the message syntax, its job is
primarily to perform address rewriting (primarily 1-to-1 canonical on
the envelope and headers followed by 1-to-n virtual on just the envelope
recipients).
The cleanup(8) service is also responsible for orchestrating the
optional header/body checks (user-provided regexp filters) and
passing the message content (headers and body) through any
milters.
--
Viktor.
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