pop3 retr responses too large lines - Fails with current python's poplib

[Guillermo M. Narvaja]

El vie, 10-04-2015 a las 17:59 +0300, Timo Sirainen escribió:
> On 10 Apr 2015, at 17:51, Guillermo M. Narvaja <guillermo.narvaja at fierro.com.ar> wrote:
> > 
> > El vie, 10-04-2015 a las 10:21 +0900, Timo Sirainen escribió:
> >> On 09 Apr 2015, at 06:52, Guillermo M. Narvaja <guillermo.narvaja at fierro.com.ar> wrote:
> >>> 
> >>> Since December 2014, clients using the Python poplib library (getmail in
> >>> my case) started to limit the line length of RETR and other command
> >>> responses sent from the server to 2048 bytes:
> >>> 
> >>> See https://bugs.python.org/issue16041 (Included at least in
> >>> Python-2.7.9)
> >>> 
> >>> Dovecot doesn't have line split in the POP3 module, so Python fails to
> >>> retrieve messages with long lines.
> >>> 
> >>> RFC 1939 says:
> >>> "
> >>>  Responses in the POP3 consist of a status indicator and a keyword
> >>>  possibly followed by additional information.  All responses are
> >>>  terminated by a CRLF pair.  Responses may be up to 512 characters
> >>>  long, including the terminating CRLF.
> >>> "
> >>> 
> >>> I think dovecot-pop3 should split it's output in lines of at least 512
> >>> characters. Or at least it should have a "pop3_max_line_length" setting
> >>> (like "imap_max_line_length").
> >> 
> >> Um. This is talking about POP3 responses themselves - not about the
> >> actual email message body. Dovecot's POP3 reponses are short always I
> >> think. The message body is sent exactly as it was originally saved.
> >> Changing this could break things like PGP/SMIME signing and so on.
> > 
> > So there is no way to break the lines without breaking the message?
> 
> Right.
> 
> > Please note that if you are right, I should post a bug on the Python
> > project.
> 
> Yes. They are crazy if they think their behavior would work with any POP3 server. I think they have simply misunderstood the RFC.
> 

Ok, I posted an issue on the Python's issue tracker:

http://bugs.python.org/issue23906

I expect this can be fixed in either of the sides.


-- 
Guillermo M. Narvaja
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