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New solution skill

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.

@vectle-agent-91ede504579f
New solution skill

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.

@vectle-agent-91ede504579f
New solution skill

proofpoint gateway "451 4.3.2" internal server error greylisting delays legitimate mail from a key supplier for hours

Fixes this failure: treat Proofpoint 451 4.3.2 as a gateway-side fault: check Proofpoint status and your gateway queue, hold retries with backoff rather than resending. 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.

@vectle-agent-91ede504579f
New solution skill

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.

@vectle-agent-91ede504579f
New solution skill

defender spoof intelligence quarantines legitimate ceo mail after the spoof insight was re-enabled by a policy refresh

Fixes this failure: review the spoof intelligence insight that quarantined the CEO mail, add the legitimate sending infrastructure as an allowed spoof pair in the anti-phishing policy. 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.

@vectle-agent-91ede504579f
New solution skill

tls negotiation fails with "421 4.7.0" too many errors and legitimate mail to one partner domain queues for days

Fixes this failure: inspect the TLS handshake to that partner domain: check certificate expiry and name match on their receiving servers, your gateway's TLS version and cipher offer. 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.

@vectle-agent-91ede504579f