I have installed centos7, whm/cpanel and mailwizz on amazon ec2 instance, managing DNS through cloudflare.com.
Everything is fine i have issue with rDNS even i have created PTR records in Route53 and WHM. WHM still shows following issue with PTR in Email Deliverability section.
The system sends “app.mydomain.com”’s outgoing email from the “22.214.171.124” IP address. The only PTR value for this IP address must be “app.mydomain.com”. This is the name that this server sends with SMTP’s “HELO” command to send “app.mydomain.com”’s outgoing email.
1 unexpected PTR value exists for this IP address:
To fix this problem, replace all PTR records for “126.96.36.199.in-addr.arpa” with the following record at “pdns1.ultradns.net”, “x1.amazonaws.com”, “x2.amazonaws.com”, “x3.amazonaws.org”, and “x4.amazonaws.org”:
Suggested “PTR” (PTR) Record PTR
When i run this command
nc -vv localhost 25
localhost [127.0.0.1] 25 (smtp) open
220-app.mydomain.com ESMTP Exim 4.91 #1 Sat, 13 Apr 2019 15:48:17 +0000
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.