How to block an email, if authenticated and sent from eMail id is different?
Question asked by sm2 - 5/3/2019 at 2:44 AM
I have domain domain.com in smartermail. Also have 2 emails one@domain.com and two@domain.com.
When I configure account in microsoft outlook there is fields one just email address and second for authentication where I wrote email address and pass.
if first address and second address different but both is exist in domain.com, smartermail allow send mails. if in first first I wrote one@domain.com but in second two@domain.com, I'll able send send email as "one", but authenticate as "two".
There is problem everybody can change first field to someone else address and send emails as him.

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Kyle Kerst Replied
Employee Post Marked As Answer
You can navigate to Settings>Protocols>SMTP In and set the Require Auth Match: Email Address to force users to send only as the email address they authenticate with. 
Kyle Kerst
Technical Support Specialist
SmarterTools Inc.
(877) 357-6278

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