postfix reject_sender_login_mismatch

Virtualmin
1

Hi, I’m hoping someone can help me figure this out. I’ve been working on it for a few hours and haven’t had any luck.

I’ve had some problems lately with someone sending e-mail to my domain with a from address from my domain. I was thinking the best way to prevent outside spam from email@domain.com to email@domain.com would be to enable the reject_sender_login_mismatch option. I set smtpd_sender_login_maps = hash:/etc/postfix/virtual, but there is a minor problem with the virtual file. All the addresses (email@domain.com) are mapped to user names without the @ (email-domain.com), so every time I try to send mail, it says that email@domain.com is not owned by email@domain.com because it things email@domain.com is owned by email-domain.com.

How can I fix this without having to completely re-install everything?

Thanks in advance,
Jeff

2

Hi Jeff,

Try something like this: check_sender_access hash:/etc/postfix/access/sender_access
in your restrictions, listing your local domain[s] in the sender_access map:
my.domain REJECT

Make the check after your legitimate sender passes the restrictions.so that your domain users can email to each other.