[Dovecot] submission_host problem

[Bambero]

On Tue, Nov 15, 2011 at 8:49 PM, Timo Sirainen <tss at iki.fi> wrote:
> On Sat, 2011-11-12 at 05:32 +0100, Bambero wrote:
>
>> I configured dovecot to use submission smtp host becouse of chroot.
>>
>> submission_host = 127.0.0.1
>>
>> Unfortunatelly:
>>
>> Nov 12 05:11:15 myhost exim[23366]: 2011-11-12 05:11:15 SMTP protocol
>> synchronization error (next input sent too soon: pipelining was not
>> advertised): rejected "EHLO myhost" H=localhost [127.0.0.1] next
>> input="MAIL FROM:<root at myhost>\\r\\n"
>
> This basically says that Dovecot's SMTP client is being noncompliant,
> because Exim doesn't advertise PIPELINING extension. But I'd rather not
> add more code to fix this, since PIPELINING gives you a little bit
> better performance anyway and you can most likely fix this by modifying
> Exim's configs in some way (I can't believe Exim wouldn't support
> PIPENING..).
>
>
Thanks for your reply.
Indeed exim supports PIPELINING by default:

# telnet mail.apisoft.pl 25
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
220 zeus.apisoft.pl ESMTP Exim 4.76 Wed, 16 Nov 2011 14:55:25 +0100
EHLO test
250-zeus.apisoft.pl Hello localhost [127.0.0.1]
250-SIZE 52428800
250-PIPELINING
250-AUTH LOGIN PLAIN CRAM-MD5 DIGEST-MD5
250-STARTTLS
250 HELP

and PIPELINING seems to work fine. But maybe there is a problem with
smtp dialog between dovecot and exim.