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Thread: Misunderstanding mail protocols
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Misunderstanding mail protocols
...SRC=188.8.131.52 DST=192.168.0.3 LEN=60 TOS=0x00 PREC=0x00 TTL=48 ID=14198 PROTO=TCP SPT=56212 DPT=25 WINDOW=5720 RES=0x00 SYN URGP=0
This goes against everything I know about email, which really isn't that much anyway. I'm wondering if this is right, or if there is a problem here. I wouldn't think I'd need SMTP open to receive mail to my POP3 server, but without SMTP being open, nothing will get through.
Secondly, if I really do need SMTP to be open, what's the best way to harden it to prevent spammers using it?