Thanks for the last gerat bit of info. I am now sending and receiving mail. I have just one last problem.
When I send mail it puts localhost.domainname as the origin. Consequently, when someone replies, I never get it because it has localhost in front of the domain name and there is no valid address for that domain.
I had the following in my main.cf file (see above)
myhostname = mmaserver.tlalbright.com
mydomain = tlalbright.com
myorigin = $mydomain
I changed it to
myorigin = /etc/mailname
in the file mailname.
I keep getting the same thing for an address
Any last suggeestions. I do greatly appreciate the help.