LMTPPROXYD(8)

📦
version 3.12.4 · 6 versions
, in fedora 44

👑 LMTPPROXYD(8) — Cyrus IMAP, but make it make sense 💅

okay bestie, so this is lmtpproxyd, living over in the Cyrus IMAP docs section of the manual pages. Manual number 8, aka the sysadmin-and-daemons zone. pull up a chair 🫶

🌸 NAME 🌸

lmtpproxyd — Cyrus IMAP documentation, obviously

so here's the tea: this is a hard linked copy of lmtpd(8). like, literally the same file, two names. it's been kept around for backwards compatibility, from back in the day when a murder frontend used its own lmtpd binaries. it's giving legacy icon behavior ✨

🎀 SYNOPSIS 🎀

lmtpd [ -C config-file ]  [ -U uses ] [ -T timeout ] [ -D ]
    [ -H ] [ -a ]

🦋 DESCRIPTION 🦋

lmtpd is an LMTP server, and its whole job is delivering mail into the IMAP mailstore. it takes commands on its standard input and answers on its standard output. 📥📤

no cap: it MUST be invoked by master(8), with those descriptors attached to a remote client connection. that's not a suggestion, that's the rules. 💀

and where does it get its config? lmtpd reads its configuration options out of the imapd.conf(5) file, unless you say otherwise with -C. periodt.

✨ OPTIONS ✨

  • -C config-file — use this specific config file, config-file, instead of the default imapd.conf(5). your config, your rules 💖
  • -U uses — the max number of times the process should be used for new connections before it shuts down. the default is 250. it's got a limit, and it knows it 👑
  • -T timeout — how many seconds the process will wait for a new connection before shutting down. heads up: a value of 0 (zero) disables the timeout entirely. the default is 60. ⏰
  • -D — run the external debugger specified in debug_command. detective mode 🔍
  • -H — tells lmtpd to expect a HAProxy protocol header from the sender. 🧚
  • -a — preauthorize connections initiated on an internet socket, instead of requiring LMTP AUTH.
⚠️ ok so about -a: this should only be used for connections coming from trusted hosts. trusted. hosts. don't be out here handing out free passes, bestie 😭🔒

🌈 EXAMPLES 🌈

lmtpd is commonly included in the SERVICES section of cyrus.conf(5), like so:

SERVICES {
    imap        cmd="imapd -U 30" listen="imap" prefork=0
    imaps       cmd="imapd -s -U 30" listen="imaps" prefork=0 maxchild=100
    lmtpunix    cmd="lmtpd" listen="/var/run/cyrus/socket/lmtp" prefork=0 maxchild=20
    sieve       cmd="timsieved" listen="sieve" prefork=0
    notify      cmd="notifyd" listen="/var/run/cyrus/socket/notify" proto="udp" prefork=1
    httpd       cmd="httpd" listen=8080 prefork=1 maxchild=20
}

look at that config. it's giving organized. it's giving main character energy 🎀

🍓 FILES 🍓

  • /etc/imapd.conf

💜 SEE ALSO 💜

go read those too, iykyk 📚

🌟 AUTHOR 🌟

The Cyrus Team. legends only 🫶

1993–2026, The Cyrus Team

and that's the whole page, bestie!! this was Cyrus IMAP version 3.12.4, dated Sep 09, 2026 — lmtpproxyd, manual section 8. slay, go deliver some mail 💅📬✨

📦 where this page comes from