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Brown@ctscorp.com>: host us-smtp-inbound-1.mimecast.com[205.139.110.242]В черных списках мой МХ не фигурирует, рейтинг в mailtestere 10/10. Связался по форме общей связи - ответ такой:
said: 554 Email rejected due to security policies -
https://community.mimecast.com/docs/DOC-1369#554
[EawCRv7xOI-oaN6EROvOgA.us288] (in reply to end of DATA command)
The DNS pointer record for this IP (ksmg.westeurope.cloudapp.azure.com.) appears to match a generic or default pattern that is often associated with spam.Я не в курсе о каких-то правилах RFC, или что-то новенькое? Забавно что у них у самих МХ выглядит как service-alpha-inbound-b.mimecast.com
Please could you update the rDNS on this IP to be something more specific to the sender and/or your organisation rather than the generic pattern that the provider has assigned by default. You may need to contact your provider in order to accomplish this rDNS change.
For instance mail.example.com would be considered far less generic than 208-83-136-1.sfo.example.com or hosted-by.example.com
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key-ru01e.mail.protection.outlook.com
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