- Plesk Onyx for Linux
- Bounce message is received with following information:
CONFIG_TEXT: your rDNS doesn't match with domain sending mail
You IP address 203.0.113.2 is associated to domain mail.example.com.
Howerver, your email has been sent from example.info.
Maybe you might want to change DNS (PTR type) and your server hostname to same value.
Here values used to make this test:
- SMTP HELO greeting contains Plesk hostname. Going to Tools & Settings > Server Settings > Full hostname is as follows:
- Sender domain
example.comis hosted in Plesk and resolves to following IP address:
# dig @126.96.36.199 example.com +short
- PTR record from
example.comIP resolves to
# dig @188.8.131.52 -x 203.0.113.2 +short
Plesk is configured to use Plesk hostname (
example.info) for SMTP greeting as going to Tools & Settings > Mail Server Settings > Outgoing mail mode is set to Send from domain IP addresses, therefore rDNS lookup on sender IP (
203.0.113.2) doesn't match because it resolves to a different domain (
Warning: Selecting this option may result in mail sent from some or all domains being marked as spam if the destination mail server uses cbl and more than one domain on the Plesk server uses the same IP address.
- Login into Plesk
- Go to Tools & Settings > Mail Server Settings
- Set Outgoing mail mode option to Send from domain IP addresses and use domain names in SMTP greeting and click OK to apply changes.