Re: [Fetchmail-users] Working around "Bad sender address syntax" error?

[Rob M. <rob...@gm...>]

On 9 September 2014 14:17, Daniel Barrett <dba...@bl...> wrote:
>
> I use fetchmail to retrieve email from an IMAP server every five
> minutes, passing it to a local postfix process on my home Linux box
> for delivery. The problem: sometimes an email has an invalid "From"
> line (usually spam), like this one with leading hyphens:
>
>   From: "- Some Dumb Spammer" <-Dum...@ex...>
>
> In this case, when fetchmail retrieves the email, the local postfix
> process raises an error:
>
>   fetchmail: SMTP error: 501 5.1.7 Bad sender address syntax
>
> This error causes fetchmail to leave the bad email sitting on the IMAP
> server, even when my .fetchmailrc file specifies "nokeep". As a
> result, fetchmail re-downloads it every five minutes. Repeat
> forever... or until I manually delete the bad email from the IMAP
> server.
>
> What's the best way to break these loops automatically, either
> deleting or delivering the bad email, without opening a security hole
> (e.g., permitting leading hyphens)?

Check the anti-spam option:

http://www.fetchmail.info/fetchmail-man.html#29

If you set 501 as a spam code fetchmail will delete any email your
Postfix server returns that code for.

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Rob MacGregor
      Whoever fights monsters should see to it that in the process he
        doesn't become a monster.                  Friedrich Nietzsche