I'm having problem like the following when I tried to send to firstname.lastname@example.org:
Diagnostic information for administrators: Generating server: mail.domain.com email@example.com mail.abacusevents.com [B]#<mail.abacusevents.com #5.0.0 smtp; 554 "Refused. You have no reverse DNS entry. Contact firstname.lastname@example.org for details."> #SMTP#
which records should I add into my internal DNS or my ISP DNS server ? MX or PTR for this problem ?
and suppose i already got one service that is running on my one public static IP address:
eg: 25 SMTP and 80 normal website and 443 (OWA, HTTPS, etc...)
do i still need to add the reverse DNS for this server in the public facing DNS ?