3 ms·
> started blocking telnet's default port But that's 23 and smtp is 25.
by emmelaich 8mo ago
> started blocking telnet's default port
But that's 23 and smtp is 25.
- jonprobably 8mo agoSMTP has and is almost blocked everywhere to dissuade spam.
- dwedge 8mo agoPresumably not on the SMTP servers they were connecting to. There are millions of IPs with port 25 open, without them email wouldn't work, so I'm not sure what you mean
- einr 8mo agoThey probably mean that port 25 is blocked on consumer ISPs/residential IP blocks to prevent malware from running an smtpd on an infected home computer or router (which used to happen a lot), but on a higher level of course no one blocks SMTP.