Could not open connection to the host on port 25 exchange 2010

Question

We have exchange hosted in the company with the public IP from our ISP, now we are facing the bounce back emails from some domains
Could not be delivered because of
Server refused mail at END OF DATA - 554 5.7.1 The message from (with the subject of (RE: Schon Properties - Final Discounted Offer - Golden System.)
matches a profile the Internet community may consider spam. Please revise your message before resending.
only few domains bounce back the emails.
aslo i cannot telnet our mail server.
so what could be the issue.
please help someone to solve this issue.
Fuad

Answer 1

Looks like some domains you are sending to have implemented spam filters and they consider your email content to be spam.  You'll need to contact them and have them set up any whitelists for your domain as needed.
http://www.faq.nuvotera.com/error%E2%80%845-7-1-the-message-from-with-the-subject-of%E2%80%84-matches-a-profile-the-internet/
As far as telnet goes make sure you are using port 25 and your static IP.  Firewalls sometimes block this internally.
-- Al