[Dovecot] CATENATE allows empty messages

[Michael M Slusarz]

Quoting Timo Sirainen <tss at iki.fi>:

> On 30.4.2013, at 0.12, Timo Sirainen <tss at iki.fi> wrote:
>
>> This could be changed I guess, but I don't think it's a bug. I  
>> don't see anything in RFC 3501 prohibiting saving empty messages.  
>> Only the MULTIAPPEND RFC says:
>>
>>      A zero-length message literal argument is an error, and MUST
>>      return a NO.  This can be used to cancel the append.
>>
>> But that doesn't prohibit zero-length CATENATE parameters.
>
> Also another way to generate empty message is to give URL to an  
> empty MIME part. Should such APPENDs also fail? I think if there's  
> no good reason to disallow empty messages I'll just keep the code as  
> it is and allow them.

Some clients treat IMAP as a pseudo-filesystem (e.g. Kolab), so I  
would agree that limiting what can be stored is a bad idea.

michael