postfix mails from non existing domain
today i think someone has hacked one of the email accounts with passwort from server.
problem, he sends phishing emails over the account with a not existing sender domain on server.
in logs i can only see the non existing sender adress, so i don't know from which account.
it would be better if the mailsystem checks the sender adress before sending as standart.
what i have to change to solve this problem?
thx
sascha
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