Block external mails that have @mydomain

Hi, I am receiving a lot of spam that has the from @mydomain, I have 2 servers, one only for internal mail, and the other for the external, in the external server, is there a way to block the mails from the exterior that are from @mydomain and not originated in any of my servers?
In other words, I want to allow sending mail from @mydomain from my network, but do not receive any from @mydomain from externals ips.
Thanks

Hi Roberts,
Thx for the reply.
Yes blacklist is an option but has to be done for every domain.
Your script works for only some combinations. I did a little research on regular expression and made the message filter.
quarantine_obfuscations_to_test:
if mail-from != "(?i)@test\\.com$"
if mail-from == "(?i)@*test+\\.*$" {
duplicate-quarantine("Policy");
drop();
So every combination that might trick user in replying to legit email will be blocked:
[email protected]
[email protected]
[email protected]

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Block external mails that have @mydomain

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