Outage in MailerSend

We're experiencing a technical issue - email delivery delay

Resolved Minor
September 09, 2025 - Started about 14 hours ago - Lasted about 7 hours
Official incident page

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Outage Details

We are experiencing a technical issue that might cause some delays while sending emails. All of our engineers are working hard to fix the issue as soon as possible. Thank you for your understanding, The MailerSend team
Latest Updates ( sorted recent to last )
RESOLVED about 7 hours ago - at 09/09/2025 04:46PM

Emails are now being processed without delays. We're keeping a close eye on the situation and are ready to intervene for any new events. Content tracking is still disabled until further notice.

MONITORING about 10 hours ago - at 09/09/2025 01:41PM

We are currently experiencing delays in email processing for the MailerSend project. Our team has identified a technical issue that is slowing down the dispatch of outgoing emails, resulting in a backlog and delayed delivery for some users.

We have taken immediate action to reduce system load, and email processing speeds are gradually improving. However, some customers may continue to see slower-than-usual email delivery as we work to fully resolve the issue. We also had to disable content tracking for the time being.

We are actively monitoring the situation and will provide further updates here as we make progress. We apologize for any inconvenience and appreciate your patience.

INVESTIGATING about 12 hours ago - at 09/09/2025 11:50AM

We are continuing to investigate this issue. Email delivery delay is currently 30+ minutes.

INVESTIGATING about 12 hours ago - at 09/09/2025 11:47AM

We are continuing to investigate this issue.

INVESTIGATING about 12 hours ago - at 09/09/2025 11:44AM

We are experiencing a technical issue that might cause some delays while sending emails. All of our engineers are working hard to fix the issue as soon as possible.


Thank you for your understanding,
The MailerSend team

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