Outgoing Mail Configration error

Question

Dear Community

Try to configure jira outgoing mail.

Get the following error:
An error has occurred with sending the test email:
com.atlassian.mail.MailException: javax.mail.SendFailedException: Invalid Addresses;
  nested exception is:
    com.sun.mail.smtp.SMTPAddressFailedException: 550 No RDNS entry for 192.168.31.30

192.168.31.30 is our Jira-Server?
RDNS was made

Any idea?

Regards

Ruth

Thomas Deiler_db00h3 · Answer

So best you accept my answer, so that others can see when searching the questions.

Thanks

Thomas

Ruth Wälti · Answer

Hi Thomas

Thank you for your answer.

It rules! :-)

Thomas Deiler_db00h3 · Answer

Dear @Ruth Wälti,

the  mail server didn't found a revers DNS entry for 192.168.31.30. This is true, because your IP address is an internal one, only, used for local networks, and will not be found.

This happens, when you talk directly to a mail server that can manage public traffic. It checks if the other mail server (thinks Jira is a mail server) is a 'real' one and tries to get a DNS name by asking the name service with your IP.

Best you connect to this mail server with login credentials or you disable rDNS check on the mail server side (cannot recommend due to security).

So long

Thomas