Attempting to setup mail server on Stash.

Sending test email returns error requesting authentication, however exchange server allows anonymous (as used by other tools such as Jenkins).

Log file from: atlassian-stash-mail.log

subject: Stash - Test email for your SMTP configuration
org.springframework.mail.MailSendException: Failed messages: com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.1 Client was not authenticated

at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:440) ~[spring-context-support-3.2.2.RELEASE.jar:3.2.2.RELEASE]

I executed on my Oracle DB:
SELECT * FROM app_property WHERE prop_key LIKE 'mail.%';

and it returned only:
mail.host
mail.sender.address
mail.useTLS

Everytime I clean the username/password fields on the "Mail server configuration" screen and click on "Save", those credentials come back.

Please advise.

Thanks
Jonny