I’d like to thank you for the tutorials you have so far, they’ve been very helpful in setting up my machine.
An important aspect that is missing in my opinion is a tutorial on how to setup a mail server, configure postfix, etc.
Since Google Apps is not free anymore this becomes a more important issue.
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@ngoctien333: What kind of issues are experiencing?
this seem mail server sending mail have many issues
Have an SPF record? Setup Domain keys? Reverse-lookup working?