Is CodeTwo Mail flow down?
Current CodeTwo Mail flow status is UP

Identified - We are currently investigating this issue. Some emails sent from users in this region might be delayed because of Microsoft Azure issues (degraded performance of Azure scaling capabilities and Exchange Online Protection availability issues). Email signatures are added correctly. We're currently forcing failover services and investigating the problem with Microsoft. Apr 04, 2024 - 14:18 UTC

Identified - Our monitoring team have noticed that within the last 24 hours a large number of auto replies sent from Microsoft 365 tenants (everywhere in the world) have been considered as spam by Microsoft and thus not delivered to CodeTwo for final processing. Therefore, these messages have not been delivered to final recipients.It looks like Microsoft, for some reason, started to classify auto replies (and maybe also other types of automated messages, but we have not been able to confirm this yet) as spam or phishing and send them through a new high-risk delivery pool with IP range 40.95.0.0/16 (which is not a part of official "spf.protection.outlook.com"). Since Microsoft native mechanisms indicate that these emails are high risk messages, our software security mechanisms reject them to protect our IPs reputation. We have started working on this problem with Microsoft Premier Support now, but we recommend that you contact Microsoft support for assistance as well.To apply a temporary fix, you can exclude auto replies from going through CodeTwo transport rule as described in this article (https://www.codetwo.com/kb/automatic-replies-should-not-be-processed/), but note that these emails may still get blocked/rejected on the recipient’s end, as most of mail servers do not accept emails sent through the high-risk delivery pool (https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/outbound-spam-high-risk-delivery-pool-about?view=o365-worldwide#high-risk-delivery-pool). All standard emails sent by users are not affected by this problem. The next update will be provided within the next 4 hours. Jul 26, 2023 - 10:33 UTC

Identified - Our monitoring team have noticed that within the last 24 hours a large number of auto replies sent from Microsoft 365 tenants (everywhere in the world) have been considered as spam by Microsoft and thus not delivered to CodeTwo for final processing. Therefore, these messages have not been delivered to final recipients.It looks like Microsoft, for some reason, started to classify auto replies (and maybe also other types of automated messages, but we have not been able to confirm this yet) as spam or phishing and send them through a new high-risk delivery pool with IP range 40.95.0.0/16 (which is not a part of official "spf.protection.outlook.com"). Since Microsoft native mechanisms indicate that these emails are high risk messages, our software security mechanisms reject them to protect our IPs reputation. We have started working on this problem with Microsoft Premier Support now, but we recommend that you contact Microsoft support for assistance as well.To apply a temporary fix, you can exclude auto replies from going through CodeTwo transport rule as described in this article (https://www.codetwo.com/kb/automatic-replies-should-not-be-processed/), but note that these emails may still get blocked/rejected on the recipient’s end, as most of mail servers do not accept emails sent through the high-risk delivery pool (https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/outbound-spam-high-risk-delivery-pool-about?view=o365-worldwide#high-risk-delivery-pool). All standard emails sent by users are not affected by this problem. The next update will be provided within the next 4 hours. Jul 26, 2023 - 10:33 UTC

Investigating - End-user emails might be bounced back (no matter if the go through CodeTwo or not) due to issues on Microsoft end. Microsoft just reported that the issue is related to M365 services and might impact any M365 users: Users are reporting receiving an error including "550 5.4.1 Recipient address rejected: Access denied" and we are investigating further. More details can be found in the admin center under EX522020. See more here: https://twitter.com/MSFT365Status/status/1630983423694077979. Please contact Microsoft for more information. We will be monitoring the situation as well. Mar 01, 2023 - 17:51 UTC

Investigating - End-user emails might be bounced back (no matter if the go through CodeTwo or not) due to issues on Microsoft end. Microsoft just reported that the issue is related to M365 services and might impact any M365 users: Users are reporting receiving an error including "550 5.4.1 Recipient address rejected: Access denied" and we are investigating further. More details can be found in the admin center under EX522020. See more here: https://twitter.com/MSFT365Status/status/1630983423694077979. Please contact Microsoft for more information. We will be monitoring the situation as well. Mar 01, 2023 - 17:51 UTC