Liam: > Ah, so LMTP can't tell its client to try again later? It seems I'll be > writing an SMTP server...
The LMTP protocol supports 4XX replies just like SMTP.
The main differences are:
- LMTP uses LHLO instead of EHLO/HELO
- LMTP has one END-OF-DATA status per recipient, instead of just one
status for the entire mail transaction.
Wietse
