Qmail Dovecot Authentication
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To authenticate Qmail Submssion/SMTPS against Dovecot, instead of vpopmail, download and compile [this] file
# wget https://raw.githubusercontent.com/qmtoaster/source/main/qdovauth.c # gcc -o qdovauth qdovauth.c # mv qdovauth /home/vpopmail/bin # chown vpopmail:vchkpw /home/vpopmail/bin/qdovauth # chmod 755 /home/vpopmail/bin/qdovauth Add services to Dovecot configuration file service stats { unix_listener stats-reader { user = vpopmail group = vchkpw mode = 0660 } unix_listener stats-writer { user = vpopmail group = vchkpw mode = 0660 } } service auth { unix_listener auth-qmail { mode = 0600 user = vpopmail group = vchkpw } } # systemctl restart dovecot Change Submission & SMTPS run files: #VCHKPW="/home/vpopmail/bin/vchkpw" VCHKPW="/home/vpopmail/bin/qdovauth" # qmailctl stop # qmailctl start You should be good to go. Check for success (or failure) in /var/log/maillog, add to run file export QDOVAUTH_LOG="" ...qdovauth[210722]: passdb: user@domain.tld auth succeeded:IP:127.0.0.1 or ...qdovauth[210722]: passdb: user@domain.tld auth failed:IP:127.0.0.1