Unable to send an email from a Plesk server, the delivery fails with one of the following error messages:
554-example.com (hostname) ESMTP Service not available
554-No SMTP service
554 invalid DNS PTR resource record, IP=203.0.113.2
554-Bad DNS PTR resource record.
There is no DNS PTR record for the sender's IP address:
# dig @220.127.116.11 +short example.com
# dig -x 203.0.113.2 +short
(Empty output or it resolves to a domain that doesn't resolve to the sender's IP address)
example.comis a domain hosted on a Plesk server and
203.0.113.2is the Plesk IP address assigned to the domain in Plesk
The mail message is rejected due to security policy on the recipient side.
Note: DNS propagation usually takes 24-48 hours.
- Contact the IP address provider or the Internet Service Provider (ISP) in order to add an appropriate PTR record to the IP addresses configured on the Plesk server.
- In case of Plesk is installed on a Cloud Server, check the article: How to add PTR record to Cloud Server with installed Plesk?
How to specify the hostname used by MailEnable for sending outbound mail
How to change Postfix SMTP banner?