For the past two days, all CF generated mail (using CF Mail or ims Mail's CFX tag) are bouncing after being sent and immediately being forwarded to the undeliverable folder. I'm using IIS SMTP server for the push out. I've checked to make sure the service is running, and we have made no changes to the SMTP server settings, nor to the settings for the CFMail, etc. I've also checked DNSStuff just in case we got our IP blacklisted, which it is not. And, I see no rhyme or reason as to where the mail is to be sent to, it still bounces. I've also checked to make sure that we have a valid From address. Looking at the mail.log, the messages are either: Invalid Addresses; nested exception is: class javax.mail.SendFailedException: 550 <[EMAIL PROTECTED]> No such user here (the vast majority of log entries). Invalid Addresses; nested exception is: class javax.mail.SendFailedException: 550 Authentication is required for relay Usually comes from the form mail Now, the majority of the messages for the past two days have been a list we send to everyday without problem, there can't be that many invalid addresses. Also, some of the other form mail that bounces is a autoresponse sent back to the user who filled out the form, using their own address. I'm out of ideas on how to solve this. Help. Thanks, Mark
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