Thank you Gerald!
I've just checked several hours ago this idea about SMTP MTA is doing weird things, so I captured traffic (tcpdump on localhost, port 25) and I see that MTA is not problem here, see below cut of the dump in text viewable format by tcpflow, highlighted Date with red:
127.000.000.001.00025-127.000.000.001.36526: 220 otrs.paymantix.net ESMTP Postfix
127.000.000.001.36526-127.000.000.001.00025: EHLO otrs.paymantix.net
127.000.000.001.00025-127.000.000.001.36526: 250-otrs.paymantix.net
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
127.000.000.001.36526-127.000.000.001.00025: MAIL FROM:<>
127.000.000.001.00025-127.000.000.001.36526: 250 2.1.0 Ok
127.000.000.001.36526-127.000.000.001.00025: RCPT TO:<r.ovchinnikov@paymantix.com>
127.000.000.001.00025-127.000.000.001.36526: 250 2.1.5 Ok
127.000.000.001.36526-127.000.000.001.00025: DATA
127.000.000.001.00025-127.000.000.001.36526: 354 End data with <CR><LF>.<CR><LF>
127.000.000.001.36526-127.000.000.001.00025: MIME-Version: 1.0
Subject: [Ticket#0101297] RE: test message, do not reply
X-Powered-BY: OTRS - Open Ticket Request System (http://otrs.org/)
X-Mailer: OTRS Mail Service (4.0.7)
Date: Thu, 7 May 2015 14:15:03 +0000
Precedence: bulk
X-Loop: yes
Auto-Submitted: auto-generated
Message-ID: <1431008103.834083.466920457.1313.1@otrs.paymantix.net>
To: Roman Ovchinnikov <r.ovchinnikov@paymantix.com>
Organization: Paymantix
From: support@ecommpay.com <support@ecommpay.com>
In-Reply-To: <554B48AE.2090205@paymantix.com>
Content-Type: multipart/alternative; boundary="----------=_1430997303-3991-2"

As you can see, message received by MTA is already with DATE header, so, from my point of view the problem is on OTRS' side somehow. I can even add the dump file itself if needed.

Ovchinnikov Roman, Paymantix
Cell +7 (926) 262-40-05 | Email: r.ovchinnikov@paymantix.com| Skype: rovchinnikov.mm
On 07.05.2015 15:58, Gerald Young wrote:
This is more about your MTA/SMTP server than it is about OTRS. OTRS doesn't really do anything more than use mailing APIs to adjust offset. 

But yes, offset on "Date" is wrong, but 9:30 UTC= 12:30 UTC+3.

https://www.google.com/search?q=smtp+header+utc+offset+date

On Thu, May 7, 2015 at 4:40 AM, Roman Ovchinnikov <r.ovchinnikov@paymantix.com> wrote:
Hello!
Any ideas about this?

Ovchinnikov Roman, Paymantix
Cell +7 (926) 262-40-05 | Email: r.ovchinnikov@paymantix.com| Skype: rovchinnikov.mm
On 30.04.2015 13:13, Roman Ovchinnikov wrote:
> Hello!
> Recently we have installed otrs 4.0.7 and found that emails being sent
> from system has wrong timezone settings in Date field, for example:
>
> Received: from mail.paymantix.com (LHLO mail.paymantix.com) (78.140.183.180)
>  by mail.paymantix.com with LMTP; Thu, 30 Apr 2015 09:30:28 +0000 (UTC)
> Received: from mail.paymantix.com (localhost [127.0.0.1])
>       by mail.paymantix.com (Postfix) with ESMTPS id 9962116113E
>       for <r.ovchinnikov@paymantix.com>; Thu, 30 Apr 2015 09:30:28 +0000 (UTC)
> Received: from localhost (localhost [127.0.0.1])
>       by mail.paymantix.com (Postfix) with ESMTP id 8C8AA161198
>       for <r.ovchinnikov@paymantix.com>; Thu, 30 Apr 2015 09:30:28 +0000 (UTC)
> X-Virus-Scanned: amavisd-new at paymantix.com
> Received: from mail.paymantix.com ([127.0.0.1])
>       by localhost (mail.paymantix.com [127.0.0.1]) (amavisd-new, port 10026)
>       with ESMTP id BT8gD6m4-Jxz for <r.ovchinnikov@paymantix.com>;
>       Thu, 30 Apr 2015 09:30:28 +0000 (UTC)
> Received: from otrs.paymantix.net (unknown [78.140.183.183])
>       by mail.paymantix.com (Postfix) with ESMTPS id 778EA16113E
>       for <r.ovchinnikov@paymantix.com>; Thu, 30 Apr 2015 09:30:28 +0000 (UTC)
> Received: from otrs.paymantix.net (localhost [127.0.0.1])
>       by otrs.paymantix.net (Postfix) with ESMTP id 5FF5F93
>       for <r.ovchinnikov@paymantix.com>; Thu, 30 Apr 2015 09:30:03 +0000 (UTC)
> MIME-Version: 1.0
> Subject: [Ticket#0100341] RE: test
> X-Powered-BY: OTRS - Open Ticket Request System (http://otrs.org/)
> X-Mailer: OTRS Mail Service (4.0.7)
> Date: Thu, 30 Apr 2015 12:30:03 +0000
>
>
> as you can see, date in mail server messages are ok
> 09:30:28 +0000 (UTC)), while
> Date: Thu, 30 Apr 2015 12:30:03 +0000
>
> so, offset is wrong. Server itself has UTC timezone, OTRS is configured as UTC +3 .
>
> Not sure what else should be tweaked, googling didn't give me any insights on this.
>

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