If I take any host from
why I'm not able to telnet to any of the specified ports ? I'm getting:
"Connecting To pop.1and1.com...Could not open connection to the host, on port 995 : Connect failed"
When I try to telnet on port 25 to SMTP Server mail.o2online.de port 25 I can see in Wireshark that the server responds with an RST/ACK packet so the port must be closed, so how can one send e-mails when it is closed?