Имеется Postfix, в main.cf правила:
smtpd_etrn_restrictions = reject
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks,
permit_sasl_authenticated,
reject_invalid_helo_hostname,
reject_non_fqdn_helo_hostname,
reject_unknown_helo_hostname,
reject_invalid_hostname,
reject_non_fqdn_hostname,
reject_unknown_hostname
smtpd_recipient_restrictions = permit_mynetworks,
permit_sasl_authenticated,
reject_non_fqdn_recipient,
reject_unknown_recipient_domain,
reject_unlisted_recipient,
reject_unauth_destination,
reject_unauth_pipelining,
smtpd_sender_restrictions = permit_mynetworks,
reject_non_fqdn_sender,
reject_unknown_sender_domain,
reject_unlisted_sender
smtpd_data_restrictions = permit_mynetworks,
reject_multi_recipient_bounce
smtpd_client_restrictions = permit_mynetworks,
reject_unauth_pipelining,
permit_mynetworks,
reject_unknown_clientReturn-Path: <molchanov.s@sberbank.ru>
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Date: Fri, 28 Oct 2016 04:20:23 -0300
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From: =?UTF-8?B?0J/QkNCeICLQodCx0LXRgNCx0LDQvdC6IiDQnNC+0LvRh9Cw0L3QvtCy?= <molchanov.s@sberbank.ru>
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