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I spent 2+ hours figuring out why our Action Mailbox does not recognize some emails and route them properly. The solution was to add the single letter "O" to our SMTP server config. Mailing is hard.

13/11/24, 6:00 am0 reposts1 like

Matouš Borák

@bora.ma

13 Nov 2024

Without the "O" flag, emails coming into Rails missed the "X-Original-To" header. The tricky part was understanding that it was only the Rails pipeline that had this problem. When delivering the same emails locally, they did have the header, gosh! 😅