Problem :
[email protected] host mail.karyo.com [202.x.xx.xx] SMTP error from remote mail server after MAIL FROM:<[email protected]> SIZE=531718: 501 5.7.0 Domain must resolve [email protected] host mail.karyo.com [202.x.xx.xx]
Solusi :
reverse-dns (PTR Record) IP nya musti valid ( sama dengan domain nya ) .
Untuk solusi bisa lihat di artikel Cara cek validasi DKIM,SPF dan RDNS domain.
