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Announcements

SpamTitan Gateway / Private Cloud sending all message through Sandboxing -- 2006/04/06
Date:  2026, April 6, 10:15 AM ET Problem: Starting around 4 hours ago, many systems started sending a much higher rate of messages to Sandboxing, with th...
SpamTitan – Scheduled Maintenance
What:  Private Cloud SpamTitan Version Upgrade             Shared Cloud SpamTitan Upgrade When:  Shared Cloud: 14 April             Private Cloud: Bet...
EncryptTitan Outbound IP 34.237.18.131 was listed on SpamHaus from 14:45 - 16:45 (March 31, 2026)
Date:  March 31, 2026 17:40 PM EncryptTitan Outbound IP was listed on SpamHaus from 14:45 - 16:45 GMT (March 31, 2026) Between about 14:45 (10:45 AM ET) ...
Scheduled maintainance on US2.titanhq.com 09/03/2026
Dear customers, We will be adding additional resources to this SpamTitan cloud at 10 am GMT on the 9th of March. This will not cause any server downtime ho...
(Delist completed) cloud-out-d.spamtitan.com, IP 34.194.51.1, was being blocked by zen.spamhaus.org
*** The Delisting of IP 34.194.51.1 has been completed *** Date:  2026 3 Feb 11:30 AM ET US / 16:30 GMT Problem:  cloud-out-d.spamtitan.com, IP address 34...
Office365 returning "451 4.3.2 Temporary server error. Please try again later ATTR2" --- not SpamTitan related: 2026 22 January
Date:  2026/January 22 - 2:30 PM ET US / 19:30 GMT Starting around Jan 22 17:47 GMT (about 2.75 hours ago), Office365 overall started returning the foll...
Mail Delay: us4-smtp-ui cluster --- 14 Jan, 2026
Date/Time: 12:30 ET US-- 14 Jan, 2026 Around 12:15PM ET US, there was slowdown in mail flow on US4 SpamTitan clouds. There is current a significant ...
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...