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Prevent sending as different mail account

C

CalibeR.50

New Pleskian
Hi,

how can I prevent users from sending mail as a different account than they are authenticated as?

Example:
Webspace example.com has a mail account [email protected]
Webspace whatever.com has a mail account [email protected]
Both webspaces are sharing the same IP

It's now possible for either accounts to spoof the other account, for example the user of [email protected] can send emails with "[email protected]" in the from header. It's also possible to send as non existent accounts and even domains.


Is there any option to prevent this?
 
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