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From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no>
To: Benjamin Lutz <mail@maxlor.com>
References: <201001141016.56877.mail@maxlor.com>
Date: Thu, 14 Jan 2010 13:07:39 +0100
In-Reply-To: <201001141016.56877.mail@maxlor.com> (Benjamin Lutz's message of
	"Thu, 14 Jan 2010 10:16:56 +0100")
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Cc: freebsd-chat@freebsd.org
Subject: Re: How Fetchmail made me a spammer
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Benjamin Lutz <mail@maxlor.com> writes:
> 2) Fetchmail downloads that 20MB email from the public POP3 server.
> 3) Fetchmail tries to pass the email to the local postfix server.
> 4) Postfix refuses the email with a permanent 552 error because
>    it's larger than 10MB.
> 5) Fetchmail generates and sends a rejection notice, but does not
>    delete the 20MB Email from the POP3 server because the
>    "softbounce" option is still the default.
> 6) Fetchmail sleeps 60 seconds.
> 7) Continue at step 2).
> [...]
> - Fetchmail's defaults are dangerous. The softbounce option, which is the
>   default (the manpage claims it'll be disabled by default with the next
>   version,) can generate large amounts of spam.

None of this would have happened if you were using IMAP instead of POP.
Unlike POP, IMAP a) provides a way to mark a message as "processed"
without deleting it and b) does not renumber messages or reuse message
numbers.

DES
--=20
Dag-Erling Sm=C3=B8rgrav - des@des.no