Qmail LDAP Authentication

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To authenticate Qmail Submssion/SMTPS against LDAP server instead of vpopmail download and compile [this] file

# wget https://raw.githubusercontent.com/qmtoaster/source/main/qldapauth.c
# dnf install openldap-devel
# g++ -o qldapauth qldapauth.cpp -lldap
# mv qldapauth /home/vpopmail/bin
# chown vpopmail:vchkpw /home/vpopmail/bin/qldapauth
# chmod 755 /home/vpopmail/bin/qldapauth

Change Submission & SMTPS run files:

#VCHKPW="/home/vpopmail/bin/vchkpw"
VCHKPW="/home/vpopmail/bin/qldapauth"
export LDAP_HOST="192.168.1.x"
export LDAP_PORT=389

# qmailctl stop
# qmailctl start

Check for success (or failure) in /var/log/maillog.

...qldapauth[246984]: Auth succeded for: administrator@domain.tld:192.168.1.x
or
...qldapauth[246984]: Auth failed for: administrator@domain.tld:192.168.1.x