E-Mail notification setup doesn't work (5.7.1 Client was not authenticated)

I try to setup the SMTP Mail settings in the admin section to obtain mail support.
But when I click "Send Test Mail" I get an error:

"com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.1 Client was not authenticated"

I use exactly the same settings like TeamCity.
TeamCity sends correct notifications, but YouTrack would not.
We use a MS 2010 Exchange Server with SMTP and no SSL/TLS.

Does anyone has a suggestion for me?

Hello Ecke,

Sorry for not responding earlier.
Did you check if emails can be sent and received from and to the mailbox server?
Check credentials?
BTW, am I correct you would like to set up support process by email so that emails become issues in YouTrack? That's not actually notifications. This can be set up under Mailbox integration settings.

Are you on InCloud or have a Stand-alone YouTrack?

Thank you.
We have a Stand-alone YouTrack.
And i want not to set up email-to-issue.
I try to get the "email members about new issues/changes" work.

With Outlook i can use the account with same credantials.
And TeamCity works fine with this credantials.
Only YouTrack won't work.

Thank you for details.
Please, take a look at the similar issue.
Please, try again with SMTP + TLS.

Thank you and let us know, if need any further assistance.

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