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We are upgrading our servers and for CFMAIL we now need to connect to the server using username and password. With Powershell everything is working and I received the email.
With CFMail, I always run into this issue "SMTPSenderFailedException: 550 Submitter failed to authenticate "
The only thing I could find is this old post Charlie Arehart
https://www.carehart.org/blog/2009/4/18/cfmail_530_error
So is this still an issue with CF 2023?
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Yes, it's still an issue, because Windows Authentication is proprietary. The easiest way to get around this is to install a local SMTP server that doesn't require it and limit access to that server.
Dave Watts, Eidolon LLC