The mail.local Delivery Agent
The mail.local program is a delivery agent designed to replace the normal delivery agent on many, but not all, versions of Unix. Read the file mail.local/README for up-to-date information about how to determine whether your version of Unix will support mail.local.
On systems that support it, the mail.local program’s chief advantage over your standard local delivery agent is that it can use LMTP for local delivery.[165] With LMTP, delivery of a single envelope to multiple recipients is more robust. LMTP is similar to SMTP, but it is designed for local delivery. It uses an acknowledged protocol that allows each recipient’s status to be reported individually.
[165] * LMTP is documented in RFC2033.
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