I have a raspberry pi running postfix. I Realised unless I open port 25 I absolutely cannot receive emails (I have 587 open and can send but not receive them). However I heard there are scaries online which someone could potentially send emails from your server without consent. I believe as well my ISP doesn’t block port 25. Is there anything I should do right now before opening port 25, or should everything be safe enough?
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Many ISPs will also block inbound SMTP unless you have business account (and sometimes even then) because it’s a common malware/spam vector.
If you insist on going through with this the key thing is to make sure that you’re not an open relay.