Major incident

SMTP2GO: Softbounce Errors

Affected: Email sending (SMTP service)

Current status of SMTP2GO: Operational — live SMTP2GO status

Timeline

1. Oct 15, 2026, 15:03 UTC
   investigating
   The team recently updated how our servers process traffic. Specifically, SMTP (https://www.rfc-editor.org/info/rfc5321/#section-2.3.8) requires 0x0d immediately before 0x0a; a recent patch to Exim against "SMTP smuggling" has altered its behavior when it encounters a missing 0x0d. The team is looking into rolling back this update, but in the meantime, we are suggesting connecting to 45.33.50.34, 43.228.184.6, or 45.33.53.153 instead of the mail.smtp2go.com hostname as a potential workaround.
2. Oct 15, 2026, 17:23 UTC
   resolved
   This incident has been resolved.

Updates as published by SMTP2GO (original).