How to resolve mail spoofing problems

MailCleaner Support
Added about 3 years ago

To avoid mail spoofing (forged mails), you can use authentication this way:
1) (OPTIONNAL !!! : Only needed if you want to allow Outgoing relay for this domain) Configuration -> Domains -> YourDomain -> Outgoing relay : Check Allow users to use SMTP authentication
2) Configuration -> Domains -> YourDomain -> Filtering : Check Reject unauthorized messages from this domain
3) Configuration -> SMTP -> Allow external relaying for these hosts : Place here all adresses of servers which won't need an authentication to send mails (all your servers or technical partner's servers)