At such sites, when pop3 is so configured, and when all users
read their mail with popd, there is an advantage to delivering directly to each user??™s mbox
file with mail.local.
10.3.3.7 -l (lowercase L)
Turn on LMTP mode mail.local command-line switch
The preferred way to run mail.local is in LMTP mode. LMTP is described in RFC2033.
Without LMTP (when there are multiple users in the envelope) it is possible for delivery to
fail for a single user. When this happens, unexpected problems might occur with the good
users. Sometimes they will receive duplicate messages and sometimes they will receive mail
after a long and unexplained delay.
At sites that handle a large amount of mail for many users, LMTP mode is highly recommended.
Multiple recipients per envelope are gracefully handled with LMTP. Each hands a
separate error or success code back to sendmail, so there is never any confusion about what
was and was not delivered.
If, despite these advantages, you wish to turn off LMTP mode in mail.local, you can do so
by omitting this -l command-line switch:
define(`LOCAL_MAILER_ARGS??, `mail.local DOL(u)??)
?†‘
-l has been omitted
Here, we first omitted the FEATURE(local_lmtp) to prevent the local delivery agent??™s flags
from being set up for LMTP. We then declare mail.local without the -l to prevent it from
speaking LMTP.
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