LMTPPROXYD(8)

💖 LMTPPROXYD(8) 💖

okay bestie, welcome to the Cyrus IMAP manual page for lmtpproxyd — yes it's section 8, yes it's giving sysadmin, and yes I'm about to make it make sense 🫶

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✨ NAME ✨

lmtpproxyd — Cyrus IMAP documentation

so here's the tea: this is a hard linked copy of lmtpd(8), kept around for backwards compatibility from the days when a murder frontend used its own lmtpd binaries. that's it, that's the whole origin story 💅

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✨ SYNOPSIS ✨

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

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✨ DESCRIPTION ✨

lmtpd is an LMTP server used to deliver mail to the IMAP mailstore. it accepts commands on its standard input and responds on its standard output. it MUST be invoked by master(8) with those descriptors attached to a remote client connection — like, that's not optional, bestie, that's the rules 🔥

lmtpd reads its configuration options out of the imapd.conf(5) file unless specified otherwise by -C.

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✨ OPTIONS ✨

• -C config-file — use the specified configuration file config-file rather than the default imapd.conf(5). choosing your own destiny, love that for you 🎀
• -U uses — the maximum number of times that the process should be used for new connections before shutting down. the default is 250.
• -T timeout — the number of seconds that the process will wait for a new connection before shutting down. note that a value of 0 (zero) will disable the timeout. the default is 60.
• -D — run external debugger specified in debug_command.
• -H — tell lmtpd to expect a HAProxy protocol header from the sender.
• -a — preauthorize connections initiated on an internet socket, instead of requiring LMTP AUTH.

⚠️ ok warning time: -a should only be used for connections coming from trusted hosts. like, genuinely. do not be cute with this one 😭

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✨ 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 file serving looks 🌈✨

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✨ FILES ✨

• /etc/imapd.conf

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✨ SEE ALSO ✨

imapd.conf(5), master(8)

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✨ AUTHOR ✨

The Cyrus Team 👑

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✨ COPYRIGHT ✨

1993–2026, The Cyrus Team

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and that's the whole page, bestie — go forth and deliver mail responsibly 💜🦋🌸

version 3.12.3 · dated Jul 15, 2026 · LMTPPROXYD(8) — mwah, iconic, periodt 💅💖