com.atlassian.mail.MailException: com.sun.mail.smtp.SMTPSendFailedException: 550 5.7.60 SMTP; Client

Muraleetharan Ramaraj

 ERROR [] Sending mailitem To='M.Ramaraj-ext@abc.com' Subject='(LI-48) Test 3' From='support.internet@abc.com' FromName='Ramaraj, Muraleetharan (Jira)' Cc='null' Bcc='null' ReplyTo='null' InReplyTo='<JIRA.19047.1613766606000@Atlassian.JIRA>' MimeType='text/html' Encoding='UTF-8' Multipart='javax.mail.internet.MimeMultipart@3bf20346' MessageId='null' ExcludeSubjectPrefix=false' anonymous Mail Queue Service Error occurred in sending e-mail: To='M.Ramaraj-ext@abc.com' Subject='(LI-48) Test 3' From='support.internet@abc.com' FromName='Ramaraj, Muraleetharan (Jira)' Cc='null' Bcc='null' ReplyTo='null' InReplyTo='<JIRA.19047.1613766606000@Atlassian.JIRA>' MimeType='text/html' Encoding='UTF-8' Multipart='javax.mail.internet.MimeMultipart@3bf20346' MessageId='null' ExcludeSubjectPrefix=false'
com.atlassian.mail.MailException: com.sun.mail.smtp.SMTPSendFailedException: 550 5.7.60 SMTP; Client does not have permissions to send as this sender

Nic Brough -Adaptavist-

There is not a lot much to expand on here.  The last line of the error you have here really is telling us the core of the problem - the user sending the mail does not have permission to send mail. 

This will almost always be down to a misconfigured mail server, a sender that looks malicious, or one that is configured to be harsh on potential spam and has caught your user in the filters.

You'll need to talk to your email administrators and ask them why there is a block