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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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11
queue/queue.go
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@ -101,9 +101,10 @@ type Msg struct {
NextAttempt time.Time // For scheduling.
LastAttempt *time.Time
LastError string
Has8bit bool // Whether message contains bytes with high bit set, determines whether 8BITMIME SMTP extension is needed.
SMTPUTF8 bool // Whether message requires use of SMTPUTF8.
Size int64 // Full size of message, combined MsgPrefix with contents of message file.
Has8bit bool // Whether message contains bytes with high bit set, determines whether 8BITMIME SMTP extension is needed.
SMTPUTF8 bool // Whether message requires use of SMTPUTF8.
Size int64 // Full size of message, combined MsgPrefix with contents of message file.
MessageID string // Used when composing a DSN, in its References header.
MsgPrefix []byte
// If set, this message is a DSN and this is a version using utf-8, for the case
@ -199,7 +200,7 @@ func Count(ctx context.Context) (int, error) {
// this data is used as the message when delivering the DSN and the remote SMTP
// server supports SMTPUTF8. If the remote SMTP server does not support SMTPUTF8,
// the regular non-utf8 message is delivered.
func Add(ctx context.Context, log *mlog.Log, senderAccount string, mailFrom, rcptTo smtp.Path, has8bit, smtputf8 bool, size int64, msgPrefix []byte, msgFile *os.File, dsnutf8Opt []byte, consumeFile bool) (int64, error) {
func Add(ctx context.Context, log *mlog.Log, senderAccount string, mailFrom, rcptTo smtp.Path, has8bit, smtputf8 bool, size int64, messageID string, msgPrefix []byte, msgFile *os.File, dsnutf8Opt []byte, consumeFile bool) (int64, error) {
// todo: Add should accept multiple rcptTo if they are for the same domain. so we can queue them for delivery in one (or just a few) session(s), transferring the data only once. ../rfc/5321:3759
if Localserve {
@ -220,7 +221,7 @@ func Add(ctx context.Context, log *mlog.Log, senderAccount string, mailFrom, rcp
}()
now := time.Now()
qm := Msg{0, now, senderAccount, mailFrom.Localpart, mailFrom.IPDomain, rcptTo.Localpart, rcptTo.IPDomain, formatIPDomain(rcptTo.IPDomain), 0, nil, now, nil, "", has8bit, smtputf8, size, msgPrefix, dsnutf8Opt, ""}
qm := Msg{0, now, senderAccount, mailFrom.Localpart, mailFrom.IPDomain, rcptTo.Localpart, rcptTo.IPDomain, formatIPDomain(rcptTo.IPDomain), 0, nil, now, nil, "", has8bit, smtputf8, size, messageID, msgPrefix, dsnutf8Opt, ""}
if err := tx.Insert(&qm); err != nil {
return 0, err