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Office365 Deferring Messages with "451 4.7.500 Server busy." on us1-smtp-ui.titanhq.com -- July 24
Priority: 1 Affected Service: Customers using us1-smtp-ui.titanhq.com on the SpamTitan Cluster,  this started on July 24th, around 6AM GMT / 2PM ET US...
FAQ for SpamTitan v9 Upgrade
Who: SpamTitan Private Cloud and Gateway customers When: 2026   What: SpamTitan v8 upgrade to v9. This is a substantial upgrade bringing current...
Mail being deferred by Office 365 (451 4.7.500 Server busy)
Microsoft 365 appears to be applying rate limits to Spamtitan IPs causing deferred mail (451 4.7.500 Server busy) Please use the following article to fix th...
Office365/Hotmail IP addresses get SPF Fail / SPF record incorrect
If you see a message sent from an Office365/Hotmail email domain flagged for SPF Fail, it is because Office365 -occasionally- sends from IP addresses t...
SpamTitan 8.00 ISO installs download from: pkg-repo-1.titanhq.com / port 80
If you are finding the latency / problems during the Installation of the SpamTitan 8.00 Gateway ISO,  it may be related to the install downloading packages...
Mail Backlog on cloudp/cloudq/cloudr.spamtitan.com -- December 5, 2022
Currently on cloudp/cloudq/cloudr.spamtitan.com, there is a mail backlog of about 35-45 minutes.   ==> the backlog is dropping. We apologize for...
Mail Queues/Delays are cloudp/cloudq/cloudr.spamtitan.com
Currently we are experiencing mail delays on cloudp/cloudq/cloudr.spamtitan.com
Office365/Hotmail IP addresses get SPF Fail / SPF record incorrect
If you see a message sent from an Office365/hotmail email domain flagged for SPF Fail, it is because Office365 -occasionally- sends from IP addresses th...