Smtp2go outage history

Our team is currently investigating an issue causing some emails to remain in the “Processed” state to Microsoft email addresses, resulting in delivery delays and greylisting. We are working to resolve the issue. We recommend safelisting wherever possible: https://support.smtp2go.com/hc/en-gb/articles/360000471954-Allowlisting-IP-Addresses-With-Microsoft-365

While we continue to handle the ongoing issue with Microsoft domains, all indicators point to a larger, global issue with Microsoft itself. We will continue providing updates as they are available. https://groups.io/email-provider-status?isp=Microsoft+365

Microsoft has accepted responsibility for the current email delays. More details can be found on their status page and below: Issue ID: EX1467029 Affected services: Exchange Online Status: Service degradation Issue type: Incident Start time: Sep 4, 2026, 10:19 PM GMT+12 User impact Users may experience a delay in sending and receiving email messages from external domains in Exchange Online. More info Users may experience intermittent “Server busy” errors, affecting multiple mailboxes. Scope of impact This issue impacts users who may be attempting to send and receive email messages from external domains in Exchange Online. This information may be updated as our investigation continues.

We are investigating as this issue has now started affecting other providers, like Gmail

Our technical team is investigating an issue with some messages to various providers being shown as "Processed" and not reaching the recipient

Excess server burden caused by knock on effects from the Microsoft service issue caused abnormal outbound queues. A fix has been implemented and we are monitoring server queues

This incident has been resolved and mail queues have returned to normal. Thank you for your patience.

We have identified the issue causing some customers to experience connection issues and delivery delays (with emails remaining in the “Processed” state). Our team is working with urgency to resolve the issue and restore normal service.

A fix has been implemented, and we are continuing to monitor the results. Connection stability is improving, queue levels are dropping, and delayed emails are being processed.

We are continuing to monitor the situation. If you are still experiencing connection issues or delivery delays, please reach out to our support team for assistance.

This incident has been resolved. We sincerely apologise for the disruption and inconvenience caused. If you experience any further issues with connecting or email delivery, please reach out to our support team for assistance.

Our team is currently investigating an issue causing some emails to remain in the “Processed” state, resulting in delivery delays. We are working to resolve the issue.

We are continuing to investigate this issue.

A fix has been implemented, and we are monitoring the results. The backlog of emails held in the “Processed” state is now being worked through.

We are continuing to monitor.

This incident has been resolved.

European users may experience a delay in delivery statuses being updated in the dashboard. Our developers are currently working on a fix. Please rest assured that the emails have been delivered successfully despite the delayed status updates.

This incident has been resolved. If you still have emails showing as "Processed" only, please reach out to our support team who can assist further.

Our developers are investigating an issue causing delays in email processing. Some users on the affected server may see odd emails stuck in the "Processed" stage on their Activity page, whilst others are being delivered.

This incident has been resolved.

We are currently investigating an issue with email delivery

The issue has been identified and addressed

This incident has been resolved.

Our SMS partner Message Media is experiencing issues which is resulting in some SMS messages being marked as "Sending". You can subscribe to updates on their status page here: https://status.messagemedia.com/

We are still waiting for more details from our SMS partner, Message Media. You can subscribe to updates on their status page here: https://status.messagemedia.com/

Our provider has confirmed that a fix has been implemented and they are monitoring the results: https://status.messagemedia.com/

We are continuing to monitor for any further issues.

A fix has been implemented, and messaging services have recovered. We have completed validation testing and confirmed that message sending and delivery are functioning as expected.

We are aware of an issue causing delays in email delivery. Affected emails will appear as "Processed" in the Activity feed. Our development team is investigating and working to resolve the issue.

We are continuing to investigate this issue at the highest priority level.

The issue has been identified and a fix is being implemented.

The issue has been identified as a failed server that did not have an easy mitigation strategy for its failure, as it was part of an older network configuration. Measures have been put in place to re-route traffic and some delays are anticipated while the backlog gets processed. This is not anticipated to be long. We will have a full review of our strategy around this with the view to eliminate this from happening in the future.

A fix has been implemented and we are monitoring the results.

This incident has been resolved.

Degraded performance of US inbound servers is causing processing delays, intermittent timeouts and incorrect "421 Too many concurrent SMTP connections from this IP address; please try again later." errors. This is isolated to US-based servers. If you are experiencing any of these issues, please try changing the server name to mail-eu.smtp2go.com until further notice.

This incident has been resolved.

Some users may experience delays and see "Processed" emails on their Activity feed. Our developers have identified the issue and are implementing a fix.

This incident has now been resolved. New emails should flow as normal. Previously processed emails may take a little longer to update.

We are aware of an issue where some emails are currently stuck in the "Processed" status. Our team is actively taking steps to resolve the issue as quickly as possible.

A fix has been deployed and we're continuing to monitor the situation. We are seeing email queues begin to clear and expect all delayed messages to be delivered shortly. Thank you for your patience, and we apologise for the inconvenience.

This incident has been resolved.

Our development team is currently investigating the inbound mail servers, which are experiencing an unusually high volume of traffic. Users may encounter delays in message delivery while we work to identify the root cause and restore normal performance.

Our development team has resolved the incident. Please allow some time for the backlog to clear.

We are investigating an issue causing delays in email delivery in the AU region. These emails will appear as "Processed" on the "Reports > Activity" page. Our engineering team is currently working to identify the root cause and restore normal processing speeds as quickly as possible.

The issue has been identified, and a fix is being implemented.

A preliminary fix is being implemented and the backlog of processed email is being worked through.

A resolution has been implemented and we're continuing to monitor. While the backlog of "Processed" emails is clearing, clients may notice a temporary delay in event updates (such as the "Delivered" status) appearing in the Activity page reporting. These records are being processed and will be fully updated shortly.

This incident has been resolved.

We are investigating a system-wide outage. Users may experience connectivity issues. Please try connecting to mail-us.smtp2go.com or mail-eu.smtp2go.com in the meantime.

A fix has been implemented, and we are continuing to monitor.

This incident is now resolved. We apologize for any inconvenience encountered. If you experience issues connecting to our servers, please reach out to our support team for further assistance.

We are currently aware of a global issue affecting emails sent to Microsoft-hosted domains (such as hotmail.com, outlook.com, live.com, etc.). Emails affected will show as "Processed" on the "Reports > Activity" page, and delivery attempts encounter "451 4.7.650……….." responses. This is a Microsoft-wide issue affecting multiple SMTP providers/ESPs, and we are monitoring it closely as they actively work on a fix. Thanks for your patience.

This incident has been resolved.

We have identified an issue with headers for sent messages not displaying in the Activity page. We are investigating and will update.

This incident has been resolved.

Some customers may experience intermittent connection failures when connecting to "mail-au.smtp2go.com". Our development team has identified the issue and is taking corrective action to restore full stability as quickly as possible. Recommended Action: While we resolve this, you can maintain a stable connection by switching your SMTP server address to "mail.smtp2go.com".

This issue has now been resolved, and services are operating normally. We apologise for any inconvenience this may have caused. If you continue to experience any connection failures when connecting to "mail-au.smtp2go.com", please reach out to our support team for assistance.

We are currently investigating an issue affecting the mail servers. During this time, users may experience delays in email delivery.

Our team has identified a global service outage affecting Microsoft. As a result, outbound emails to Microsoft-hosted domains may be delayed. We are securely holding affected messages and will continue to automatically re-attempt delivery until Microsoft resolves the issue.

This incident has been resolved.

Some customers are experiencing issues loading the SMTP2GO login page. Please try logging in at https://app-us.smtp2go.com/login/ while we investigate this issue

We are continuing to investigate this issue. If you cannot log in, please try using: https://app-us.smtp2go.com/login/

This issue was caused by network instability at Akamai/Linode datacenters in the EU. This has now been resolved as per their bulletin on the issue.

We’re aware of an API issue when calling api.smtp2go.com/v3/email/send endpoint and the server is sending back an HTTP status Code 500 for certain emails. Our development team is investigating.

The underlying service the API uses to send emails had an intermittent fault, causing some communication issues between the services. This issue has now been resolved.