Puzzle Technology
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Softbounce Errors

Major · resolved · started 15 Oct 2026, 16:03 · resolved 15 Oct 2026, 18:24

SMTP2GO

  1. resolved · 15 Oct 2026, 18:24

    Auto-resolved by the status page: the vendor stopped reporting this incident in their feed.

  2. investigating · 15 Oct 2026, 16:04

    **2026-10-15T15:03:38.655Z** — 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.