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 →

smtp;451 Open relay not allowed - https://community.mimecast.com/docs/DOC-1369#451 [#]

smtp;451 Internal resource temporarily unavailable - https://community.mimecast.com/docs/DOC-1369#451 [#]

smtp;451 Invalid Recipient - https://community.mimecast.com/docs/DOC-1369#451 [#]

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 [#]

smtp;550 Rejected by header based manually Blocked Senders: email@example.com - https://community.mimecast.com/docs/DOC-1369#550 [#]

smtp;550 Envelope blocked - User Entry - https://community.mimecast.com/docs/DOC-1369#550 [#]

smtp;550 DMARC Sender Invalid - envelope rejected - https://community.mimecast.com/docs/DOC-1369#550 [#]

High severity

554All 554 codes →

smtp;554 Email rejected due to security policies - https://community.mimecast.com/docs/DOC-1369#554 [#]

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