MailerSend outage history

MailerSend conducted a scheduled maintenance window that temporarily affected email sending across Delivery time, Email sending API, SMTP, and the Bulk endpoint. This caused brief delays or interruptions for users attempting to send or deliver emails during the window. The maintenance began at 7:04 AM UTC and concluded about ten minutes later at 7:14 AM UTC, with services returning to normal after the window closed.

MailerSend APP experienced a brief period of degraded performance, impacting email sending and related operations. Users may have experienced slower processing or intermittent delays during this window.

From 3:19 PM UTC to 3:29 PM UTC, MailerSend reported degraded performance. The team identified the issue and implemented a fix, restoring normal operation by 3:29 PM UTC. The incident included 2 status updates on the MailerSend status page.

MailerSend APP and Website experienced a brief degraded service due to an upstream Cloudflare global outage. The incident began at Dec 5, 2025 9:04 AM UTC and was resolved by Dec 5, 2025 9:19 AM UTC, lasting approximately 15 minutes. Status updates indicated the team was investigating the upstream disruption as Cloudflare reported a global outage, with both MailerSend APP and Website shown in a degraded state.

MailerSend completed a scheduled maintenance window affecting the MailerSend APP / Email analytics component. The maintenance began at Nov 2, 2025 8:34 AM UTC and concluded at Nov 2, 2025 10:34 AM UTC, lasting about 2 hours. The status page posted two updates during the event: an in-progress maintenance notice and a follow-up indicating the service was restored. There were no user reports observed during the window, and normal operation resumed after the maintenance window.

MailerSend conducted a brief scheduled maintenance that affected core email delivery components, including SMTP, the Email sending API, the Bulk endpoint, and Delivery time. The maintenance began at Oct 15, 2025 5:34 AM UTC and concluded at Oct 15, 2025 5:39 AM UTC, lasting about 5 minutes. During this window, outbound email sending may have been briefly unavailable.

The incident was tracked with two official updates from MailerSend: one announcing the start of maintenance and another confirming its completion. Services were restored after the maintenance window.

MailerSend experienced a technical issue causing email delivery delays across four components: Email sending API, Bulk endpoint, SMTP, and Delivery time. This resulted in slower or queued emails for users during the incident.

The outage began at 11:49 AM UTC and was resolved by 4:49 PM UTC, lasting roughly 5 hours. The Status page issued 3 official updates during the incident, describing ongoing investigation and eventual restoration. A single user report from Presidente Prudente, Brazil noted emails taking too long to send at 4:10 PM UTC.

MailerSend experienced a global service disruption beginning Jun 12, 2025 7:49 PM UTC and resolving Jun 12, 2025 8:34 PM UTC, lasting roughly 45 minutes. The outage degraded performance and caused partial service outages across seven components: MailerSend APP, Email sending API, Website, SMTP, Inbound routing, Deliverability rate, and Delivery time. Users may have faced delays delivering emails, slowed UI interactions, and intermittent failures across sending and routing features while the Google Cloud outage affected core infrastructure. The provider issued 2 official updates during the incident, acknowledging the disruption and that Google Cloud was investigating; services returned to normal after Google's recovery.

MailerSend performed a scheduled maintenance window on the Delivery Time component, resulting in a brief interruption to email delivery timing. The maintenance began at May 18, 2025 7:04 AM UTC and completed at May 18, 2025 7:31 AM UTC, lasting approximately 27 minutes. The maintenance affected 1 component: Delivery time.

During the window, the Delivery time component was listed as under maintenance, and the status page transitioned the component back to up once the maintenance concluded. The provider issued 2 official status updates documenting the maintenance progress and restoration.

MailerSend conducted a scheduled maintenance window that affected three core components: Deliverability rate, Delivery time, and Email sending API. The maintenance began at 5:04 AM UTC and concluded by 5:19 AM UTC, lasting about 15 minutes, during which those components were listed as maintenance. The incident included two official status updates—one signaling the maintenance start and another confirming restoration to normal operations.

MailerSend experienced a brief reporting issue where the Delivered status in the UI did not update. Emails continued to be sent and delivered as expected, but the status indicators could have appeared out of date. The incident began at Apr 10, 2025 7:34 AM UTC and was resolved by Apr 10, 2025 10:44 AM UTC, lasting about 3 hours and 10 minutes. The MailerSend APP was the affected component, and users may have seen inconsistent status information during the window.