Mailosaur experienced a minor incident on August 11, 2025 affecting SMTP (25) and SMTP (2525) and 1 more component, lasting 41m. The incident has been resolved; the full update timeline is below.
Affected components
SMTP (25)SMTP (2525)SMTP (587)SMTP (25) with STARTTLSSMTP (2525) with STARTTLSSMTP (587) with STARTTLS
Update timeline
- monitoring Aug 11, 2025, 10:10 AM UTC
We're aware of an issue affecting some customers who are attempting to send emails to external addresses. As a result of a false-positive inclusion of one of our IP addresses in a blocklist, connections to some mail services are being rejected. The IP in question has since been removed from the list, but it may take several hours for this to propagate to other mail services. We are continuing to monitor this issue and will update when we're comfortable that this has been fully resolved.
- resolved Aug 11, 2025, 10:52 AM UTC
This incident has been resolved.