Error “ [System.NotSupportedException] No compatible authentication mechanisms found.” (266395)

Error “ [System.NotSupportedException] No compatible authentication mechanisms found.”

The attempt to send an email via SMTP results in the following error message:

[System.NotSupportedException] No compatible authentication mechanisms found.
at VI.JobService.ProcessorThread._ExecuteJob(Job job, JobResult result)
at VI.JobService.JobComponents.MailComponent.Activate(String task)
at VI.JobService.JobComponents.MailComponent._SendRichMail()
at VI.JobService.JobComponents.MailComponent._Send(MimeMessage message, MailSecurity security)
at VI.JobService.JobComponents.MailComponent._GetOrOpenSmtpConnection()
at MailKit.Net.Smtp.SmtpClient.Authenticate(Encoding encoding, ICredentials credentials, CancellationToken cancellationToken)

We use the Open Source libraries "MailKit" for mail dispatch.

These support the following standards currently:

"SCRAM-SHA-256",

"SCRAM-SHA-1",

"CRAM-MD5",

"DIGEST-MD5",

"PLAIN",

"LOGIN"

At least one of these standards needs to be activated on the mail server.

The error message above does not show which standards are supported by the current MailKit library.

This is a product defect (31043)

WORKAROUND:

None

STATUS:

This will be fixed on a future release of the product. If you require this immediately corrected, please contact support for a hotfix referencing the defect ID 31043.

31043