Possible IMAP IDLE bug in Dovecot 2.2.18 and 2.2.25

[Aki Tuomi]

On 23.08.2016 19:15, Aki Tuomi wrote:
>
>
> On 23.08.2016 15:08, cleber-listas at inetweb.com.br wrote:
>> Hello Guys,
>>   I guess that I found a bug in Dovecot 2.2.18 and 2.2.25 versions. The
>> problem it's when I try to connect in a Dovecot used a proxy to another
>> e-mail server (in our case it's a Smartermail Server) the DoveCot send a
>> lot of IDLE commands to the destination server. With that, the LOG files
>> grow and grow and grow :(
>>      I make a test with 1 connection only and if you see the log file 
>> in the
>> same second the dovecot send 25, 40 IDLE commands. But, when I 
>> disconnect
>> the client (outlook 2013) the dovecot continue to send the IDLE 
>> command for
>> some seconds.
>>      If I try to connect directly to Smartermail with Outlook this don't
>> occurrs.
>>
>
> Just to be sure, the behaviour you are expecting is that IDLE is not 
> used, right?
>
> Aki

Also, looking at the code, IDLE is only used if your server claims to 
understand it, so could you do following:

telnet backend-host backend-port
a CAPABILITY
a LOGIN username password
a CAPABILITY
a LOGOUT

and provide the output.

Aki