I installed Dovecot on my fedora core 6 system as a POP server. My goal is to be able to receive emails @mydomain.com. Right now if I send an email to email@example.com
the email bounces right back with the following information:
Your message cannot be delivered to the following recipients:
Recipient address: firstname.lastname@example.org
Reason: Remote SMTP server has rejected address
Diagnostic code: smtp;550 User unknown
Remote system: dns;mx1.mailhop.org (TCP|10.23.32.29|51983|18.104.22.168|25) (mxin2.mailhop.org ESMTP Exim 4.63 Sat, 10 Mar 2007 21:34:19 -0500)
As you can see I'm using dyndns's relay service because my isp blocks port 25. So I have redirected to port 587 by making the changes in sendmail.mc to accept incomming connections on that port. I also openned port 587 on my router's firewall.
The user exists as a regular user on my linux system so I don't know why the message isn't being received. Any help would be appreciated.