When you try to send an e-mail, it immediately gets into Mail Queue with an error
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MESSAGE NUMBER 656420
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Received: (qmail 27351 invoked by uid 7802); 2 Jun 2017 20:36:21 -0000
Message-ID: <20170602203621.27350.qmail@vm1.host-service.dp.ua>
To: alex_fear@mail.ru
Subject: =?UTF-8?B?RmFuVG95cyAtINCd0L7QstGL0Lkg0L/QsNGA0L7Qu9GM?=
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Date: Fri, 02 Jun 2017 23:36:21 +0300
From: =?UTF-8?B?RmFuVG95cw==?= <admin@fantoys.dp.ua>
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log
Jun 2 23:36:30 vm1 send: delivery 2: deferral: Sorry,_I_couldn't_find_any_host_by_that_name._(#4.1.2)/