said by Leathal:Yeap, but they don't block port 25 inbound. 
Standard network attack stuff I get. But port 25 should never be blocked.
I mean, insecure mail servers/relays are a pretty common attack vector.
But also diskace posted this a couple years ago, so you might be mistaken.
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There is a lot of details to remember so yes coaching is important. Port 25 is indeed blocked on Cable and DSL (except for static ips users).
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It is simply a matter of network management and complaints.
An impressive number of clients are infected with viruses / worms without even knowing it and spam through port 25.
The staff spent their days responding to complaints and getting IPs banished.
Since there is no ips control on the cable, all of port 25 is blocked.
For each complaint it was necessary to contact the cable distributor to find out who had the ip at such time ...
DSL clients with static ip port 25 remains open.
As you said the smtps ssl 587 port is open so you have a solution.
Nothing to do with acting in a big shot ...
If that still stands, exactly the same boat as Teksavvy, pretty sure every TPIA blocks 25.
