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feat(transport): Remote delivery over SMTP (#104)

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Implements a new mode "transport",
that allows filtermail to be used for
remote delivery.

In transport mode, filtermail listens for LMTP
connections, splits messages by domain
and performs delivery to remote MTAs over SMTP.

SMTP client tries to open socket on all resolved
addresses in parallel and uses one that succeeds
the first, fixing the issue described in:
chatmail/relay#900

Extends the built-in SMTP client
with STARTTLS support.

Extends the built-in SMTP server
with LMTP greeting support.

Groundwork required for mxdeliv endpoint
(HTTP channel for MTA-to-MTA communication):
chatmail/relay#900

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
This commit is contained in:
Jagoda Estera Ślązak
2026-04-15 22:12:09 +02:00
committed by GitHub
parent ec0413bd5f
commit cf64778f71
15 changed files with 815 additions and 120 deletions
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filtermail/src/config.rs
+6
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@@ -14,6 +14,8 @@ pub struct Config {
pub filtermail_smtp_port: u16,
#[serde(default = "Config::default_filtermail_smtp_port_incoming")]
pub filtermail_smtp_port_incoming: u16,
#[serde(default = "Config::default_filtermail_lmtp_port_transport")]
pub filtermail_lmtp_port_transport: u16,
#[serde(default = "Config::default_postfix_host")]
pub postfix_host: String,
#[serde(default = "Config::default_postfix_reinject_port")]
@@ -108,6 +110,9 @@ impl Config {
const fn default_filtermail_smtp_port_incoming() -> u16 {
10081
}
const fn default_filtermail_lmtp_port_transport() -> u16 {
10083
}
fn default_postfix_host() -> String {
"127.0.0.1".to_owned()
}
@@ -138,6 +143,7 @@ impl Default for Config {
filtermail_host: Self::default_filtermail_host(),
filtermail_smtp_port: Self::default_filtermail_smtp_port(),
filtermail_smtp_port_incoming: Self::default_filtermail_smtp_port_incoming(),
filtermail_lmtp_port_transport: Self::default_filtermail_lmtp_port_transport(),
postfix_host: Self::default_postfix_host(),
postfix_reinject_port: Self::default_postfix_reinject_port(),
postfix_reinject_port_incoming: Self::default_postfix_reinject_port_incoming(),