Home email server setup - stuck

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http://www.unix.com – Hello, Firstly, I am using Debian 7.1, updated (as of today), I installed postfix, sasl, and dovecot. I have read through various online tutorials and quick installation guides, videos etc. And, ventured into the actual text of postfix, sasl and dovecot. Everything is installed and "appears" to be running. I can start and stop the services. I have three questions: 1.) How can I troubleshoot the email process? In other words, how can I determine where the error is that is preventing me from sending and receiving email? Any tips would be greatly appreciated. 2.) I currently have (HowTos)