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Came across an issue while testing some features for ourselves in Azure where we can send an email through our SM server without authentication to local SmarterMail users only. So using it to send to an external email address such as GMail does fail, but I can still get the email delivered to any domain on my SM server. Although without authentication, the emails do fails most SPAM checks, but mostly RDNS failures which still let the emails through.
I do not like this little loophole as it appears that spammers could use our server to send SPAM at least to our own users. Any ideas how to lock this down?
We do want an unauthenticated users to be able to use our mail server period (unless they are in the SMTP Bypass list).
I see a few options in the SM Settings for Protocol Settings that lists "Enable domains SMTP auth setting for local deliveries" (unchecked)
Would this solve our issue and I do not want to make this change if it will void our SMTP Bypass list?