Resolved
We have implemented a fix for the issue causing “55X - relay denied” errors on outbound messages from certain Office 365 IPs. We have fully resolved the issue and thank you for your attention and patience.
May 20, 2025 · 05:12
Monitoring
We have implemented a fix for the issue causing “55X - relay denied” errors on outbound messages from certain Office 365 IPs. At this time, the issue appears to be resolved, and we are actively monitoring the situation.
May 19, 2025 · 14:55
Issue
We are currently experiencing an issue where outbound messages sent via our smarthost are being rejected in some cases. The error returned is:
“55X - relay denied”
This appears to affect messages originating from certain Office 365 IP addresses. Our team is investigating and working to resolve the issue.
We will provide updates as we learn more.
Carlos Rios
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