Dear Pak syafril,
Mohon bantuannya, Log tersebut terjadi lagi, padahal saya sudah update. Tue 2017-01-24 14:08:25.519: Session 066128; child 0002 Tue 2017-01-24 14:08:25.519: Accepting SMTP connection from 202.179.187.110:35190 to 10.3.50.45:25 Tue 2017-01-24 14:08:25.520: --> 220 mail.s-iki.co.id ESMTP MDaemon 16.0.2; Tue, 24 Jan 2017 14:08:25 +0700 Tue 2017-01-24 14:08:25.574: <-- EHLO mail.listrindo.com Tue 2017-01-24 14:08:25.575: --> 250-mail.s-iki.co.id Hello mail.listrindo.com [202.179.187.110], pleased to meet you Tue 2017-01-24 14:08:25.575: --> 250-ETRN Tue 2017-01-24 14:08:25.575: --> 250-AUTH LOGIN CRAM-MD5 PLAIN Tue 2017-01-24 14:08:25.575: --> 250-8BITMIME Tue 2017-01-24 14:08:25.575: --> 250-ENHANCEDSTATUSCODES Tue 2017-01-24 14:08:25.575: --> 250 SIZE Tue 2017-01-24 14:08:25.620: <-- MAIL FROM:<ady.dhir...@listrindo.com> SIZE=333312 BODY=7BIT Tue 2017-01-24 14:08:25.625: Performing PTR lookup (110.187.179.202.IN-ADDR.ARPA) Tue 2017-01-24 14:08:25.665: * D=110.187.179.202.IN-ADDR.ARPA TTL=(240) PTR=[mx2a.listrindo.com] Tue 2017-01-24 14:08:25.812: * No A/AAAA records found Tue 2017-01-24 14:08:25.812: * MDaemon configured to drop connection on PTR record mismatch Tue 2017-01-24 14:08:25.812: ---- End PTR results Tue 2017-01-24 14:08:25.812: --> 501 5.7.0 Domain must resolve Tue 2017-01-24 14:08:25.812: SMTP session terminated (Bytes in/out: 86/283) Terimakasih Panji Perdiansyah