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When I try to connect to my mailserver from my home pc like this

telnet whomakescoffee.com 25

I cannot connect. If I type in the same command on my server there is no problem. I have also tried turning off windows firewall. If I use the command (on the server):

iptables -L

I have the following rules

Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ufw-before-logging-input  all  --  anywhere             anywhere
ufw-before-input  all  --  anywhere             anywhere
ufw-after-input  all  --  anywhere             anywhere
ufw-after-logging-input  all  --  anywhere             anywhere
ufw-reject-input  all  --  anywhere             anywhere
ufw-track-input  all  --  anywhere             anywhere

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
ufw-before-logging-forward  all  --  anywhere             anywhere
ufw-before-forward  all  --  anywhere             anywhere
ufw-after-forward  all  --  anywhere             anywhere
ufw-after-logging-forward  all  --  anywhere             anywhere
ufw-reject-forward  all  --  anywhere             anywhere

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
ufw-before-logging-output  all  --  anywhere             anywhere
ufw-before-output  all  --  anywhere             anywhere
ufw-after-output  all  --  anywhere             anywhere
ufw-after-logging-output  all  --  anywhere             anywhere
ufw-reject-output  all  --  anywhere             anywhere
ufw-track-output  all  --  anywhere             anywhere

Chain ufw-after-forward (1 references)
target     prot opt source               destination

Chain ufw-after-input (1 references)
target     prot opt source               destination

Chain ufw-after-logging-forward (1 references)
target     prot opt source               destination

Chain ufw-after-logging-input (1 references)
target     prot opt source               destination

Chain ufw-after-logging-output (1 references)
target     prot opt source               destination

Chain ufw-after-output (1 references)
target     prot opt source               destination

Chain ufw-before-forward (1 references)
target     prot opt source               destination

Chain ufw-before-input (1 references)
target     prot opt source               destination

Chain ufw-before-logging-forward (1 references)
target     prot opt source               destination

Chain ufw-before-logging-input (1 references)
target     prot opt source               destination

Chain ufw-before-logging-output (1 references)
target     prot opt source               destination

Chain ufw-before-output (1 references)
target     prot opt source               destination

Chain ufw-reject-forward (1 references)
target     prot opt source               destination

Chain ufw-reject-input (1 references)
target     prot opt source               destination

Chain ufw-reject-output (1 references)
target     prot opt source               destination

Chain ufw-track-input (1 references)
target     prot opt source               destination

Chain ufw-track-output (1 references)
target     prot opt source               destination

I am using slicehost where I set up a VPS. Can they block me on port 25 or what is going on?

Thank you for your time :)

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2  
It seems far more likely that your home ISP is blocking port 25. That is somewhat common these days as a way to reduce spam. Can you connect to anything else on port 25? –  Zoredache Jul 27 '10 at 22:49

1 Answer 1

up vote 0 down vote accepted

Agreed. It is probably your ISP. Change your mail server to listen on a second port, such as 26 or 587 and try that.

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