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in DSNs, add a References header pointing to the message with deliverability issues

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so mail user agents will show DSNs threaded/grouped with the original message.
we store the MessageID in the message queue, so we have the value within reach
when we need it.

i saw a references header in a DSN from gmail on a test account. makes sense to me.
This commit is contained in:
Mechiel Lukkien
2023-07-23 17:56:39 +02:00
parent c5747bd656
commit dcb0f0a82c
8 changed files with 50 additions and 27 deletions
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2
smtpserver/dsn.go
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@ -46,7 +46,7 @@ func queueDSN(ctx context.Context, c *conn, rcptTo smtp.Path, m dsn.Message) err
// ../rfc/3464:433
const has8bit = false
const smtputf8 = false
if _, err := queue.Add(ctx, c.log, "", smtp.Path{}, rcptTo, has8bit, smtputf8, int64(len(buf)), nil, f, bufUTF8, true); err != nil {
if _, err := queue.Add(ctx, c.log, "", smtp.Path{}, rcptTo, has8bit, smtputf8, int64(len(buf)), m.MessageID, nil, f, bufUTF8, true); err != nil {
return err
}
err = f.Close()