smtp_auth_proxy - SMTP Authentication Proxy
Last updated March 2020
**Configuration Change. ** This feature is available in Momentum 4.2 and later.
The smtp_auth_proxy module allows your edge SMTP servers to forward SMTP AUTH requests onto one or more SMTP servers, with optional lookup of the authentication host for a particular user.
smtp_auth_proxy {
# Host for forwarding the SMTP AUTH request.
host = some.smtp.server
port = 25
timeout = 60
# Optionally query a database to look up the SMTP server
# for auth for a particular user.
ds_cache = smtp_auth_proxy
query = "SELECT host FROM auth_servers WHERE username = :username, localpart = :localpart, domain = :domain;"
}
Esmtp_Listener {
SMTP_Extensions = ("AUTH LOGIN" XREMOTEIP XDUMPCONTEXT XCLIENT XSETCONTEXT)
AuthLoginParameters = [
log_authentication = "true"
uri = "smtp_auth_proxy://"
]
Listen ":25" {}
}
Note
Hosts specified by the relay_hosts option are not subject to any SMTP authentication you may have implemented. Likewise when open_relay is set to true. For more information, see relay_hosts.
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