Announcements
- Office 365 Email Delivery Delays – IP Throttling (04 Sep, 2026)
- EWS is being deprecated - update permissions to continue using the Microsoft Exchange Backup product
- [✓] Service Status 18/08/2026 – us2-smtp-ui UI Access Issue Fully Resolved
- Office365 intermittent deferred messages with: "450 4.7.9 Application queue quota exceeded"
- Introduction of new ArcTitan Admin UI and OAuth 2.0 from 29 June
- SpamTitan Gateway / Private Cloud sending all message through Sandboxing -- 2006/04/06
- EncryptTitan Outbound IP 34.237.18.131 was listed on SpamHaus from 14:45 - 16:45 (March 31, 2026)
- Scheduled maintainance on US2.titanhq.com 09/03/2026
- Office365 returning "451 4.3.2 Temporary server error. Please try again later ATTR2" --- not SpamTitan related: 2026 22 January
- Mail Delay: us4-smtp-ui cluster --- 14 Jan, 2026