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Thanks. For the "lost" emails, I don't get any message back, so how can I investigate what kind of problem occurred? I did not understand the part about "unique per-message envelope sender". The password reset emails are send from an email account and so the sender name should be just the name and email of that account.

JF Meier
– JF Meier

2023-12-13 19:07:39 +00:00
Commented Dec 13, 2023 at 19:07
3

@JFabianMeier: SMTP has its own "Envelope" fields separate from the usual From:/To: headers that are within the message. The message header is what shows up in mail apps, the envelope is what controls delivery and is e.g. used to control where "bounce" messages go. So the system that sends the message can specify e.g. "From: [email protected]" in the mail headers but "FROM:<[email protected]>" in the SMTP envelope.

grawity
– grawity

2023-12-14 10:00:08 +00:00
Commented Dec 14, 2023 at 10:00

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