Good day!

Messages sent to one of our domains are dissappearing somewhere when are sent from external mail server:
Code:
Oct  8 20:37:38 mail amavis[4368]: (04368-01) Checking: RIX7aqYETgmJ [209.85.132.243] <kayrat@gmail.com> -> <iglikova@pge.kz>
Oct  8 20:37:48 mail amavis[4368]: (04368-01) FWD via SMTP: <kayrat@gmail.com> -> <iglikova@pge.kz>,BODY=7BIT 250 2.6.0 Ok, id=04368-01, from MTA([127.0.0.1]:10025): 250 Ok: queued as 4F07A480260C
Oct  8 20:37:48 mail amavis[4368]: (04368-01) Passed CLEAN, [209.85.132.243] [209.85.132.243] <kayrat@gmail.com> -> <iglikova@pge.kz>, Message-ID: <676f86d30710080737x58d40331p7ddc35efb24c320d@mail.gmail.com>, mail_id: RIX7aqYETgmJ, Hits: -2.598, size: 2126, queued_as: 4F07A480260C, 10176 ms
But when send from ours another domain, it delivers to mailbox.

What can it be?