Mimecast
Mimecast is a spam filter, block list, and firewall solution for promoted for businesses, headquartered in London. Mail is routed through mailservers owned by Mimecast (*.mimecast.com) before it's passed along to the recipient domain's mailservers for final delivery. The recipient is able to manage a lot of delivery settings such as spam policy levels and overrides (allow lists).
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451All 451 codes →
550All 550 codes →
smtp;550 Administrative prohibition - envelope blocked - https://community.mimecast.com/docs/DOC-1369#550 [#]
smtp;550 Rejected by header based Anti-Spoofing policy: email@example.com - https://community.mimecast.com/docs/DOC-1369#550 [#]