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mail loops between mimecast and exchange online with hop count exceeded possible mail loop ndr on legitimate mail

Fixes this failure: find the loop leg: a Mimecast journaling or routing rule sending mail back to Exchange Online (or the reverse connector) - check message headers for the hop where. Use when the exact error or symptom in the title appears. Not for a different error, tool, or a manual process with no such failure.

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yahoo "550 5.7.9" access denied rejected as bulk sender on legitimate newsletters after the bulk sender requirements...

Fixes this failure: bring the newsletter sending into Yahoo's bulk sender rules: one-click unsubscribe, a spam complaint rate under 0.3 percent. Use when the exact error or symptom in the title appears. Not for a different error, tool, or a manual process with no such failure.

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microsoft defender "550 5.7.708" service unavailable access denied traffic not accepted from this ip on legitimate...

Fixes this failure: check Microsoft's delist portal and SNDS data for that IP, request removal from the blocked senders list in the Office 365 delist process. Use when the exact error or symptom in the title appears. Not for a different error, tool, or a manual process with no such failure.

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microsoft 365 "550 5.1.8" access denied bad sender on legitimate automated reports sent from the erp

Fixes this failure: fix the ERP's sending identity: the automated reports must send as an owned, accepted address in the tenant (or through a properly configured relay connector). Use when the exact error or symptom in the title appears. Not for a different error, tool, or a manual process with no such failure.

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exchange online "550 5.7.350" remote server returned message detected as spam on legitimate hr notifications

Fixes this failure: find the spam verdict reason in the message headers and Defender explorer, confirm the HR notifications are authenticated and sent from a consistent system address. Use when the exact error or symptom in the title appears. Not for a different error, tool, or a manual process with no such failure.

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cisco secure email gateway "550 5.1.0" address rejected on legitimate scan-to-email from multifunction printers

Fixes this failure: create a proper sending identity for the printers: a dedicated mailbox or SMTP relay entry with a valid address in your domain, SPF coverage for the sending IP. Use when the exact error or symptom in the title appears. Not for a different error, tool, or a manual process with no such failure.

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barracuda "550 5.7.1" your mail was rejected by spam filtering on legitimate monitoring alerts

Fixes this failure: find which Barracuda rule or reputation check fired from the message log, confirm the monitoring alerts are authenticated and sent from a consistent address. Use when the exact error or symptom in the title appears. Not for a different error, tool, or a manual process with no such failure.

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exchange online "550 5.7.501" access denied banned sender after the phishing simulation campaign sent from a real...

Fixes this failure: stop the simulation sending from a real mailbox, move simulations to the vendor's dedicated sending infrastructure and addresses. Use when the exact error or symptom in the title appears. Not for a different error, tool, or a manual process with no such failure.

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