just remove the line, don't add comments

emailwiz.sh

@@ -117,7 +117,7 @@ spamassassin unix -     n       n       -       -       pipe
 dovecot_v="$(dovecot --version | cut -d '.' -f1-2)"
 dovecot_dh="ssl_dh = </usr/share/dovecot/dh.pem"
 
-[ ${dovecot_v%.*} -eq 2 ] && [ ${dovecot_v#*.} -lt 3 ] || [ ${dovecot_v%.*} -lt 2 ] && dovecot_dh="#$dovecot_dh"
+[ ${dovecot_v%.*} -eq 2 ] && [ ${dovecot_v#*.} -lt 3 ] || [ ${dovecot_v%.*} -lt 2 ] && dovecot_dh=""
 
 echo "Creating Dovecot config (v $dovecot_v)..."
 
@@ -132,7 +132,6 @@ echo "# Dovecot config
 ssl = required
 ssl_cert = <$certdir/fullchain.pem
 ssl_key = <$certdir/privkey.pem
-# You have to add ssl_dh if your Dovecot version is 2.3 or greater!
 $dovecot_dh
 # Plaintext login. This is safe and easy thanks to SSL.
 auth_mechanisms = plain login