Getting fqdn, postfix, Comcast to all play nice together

From	"John T. Haggerty" <jpcookie@gmail.com>
Newsgroups	linux.debian.user
Subject	Getting fqdn, postfix, Comcast to all play nice together
Date	2016-08-25 11:20 +0200
Message-ID	<s9YZk-7vE-7@gated-at.bofh.it> (permalink)
References	(12 earlier) <s9YZk-7vE-33@gated-at.bofh.it> <s9YZk-7vE-35@gated-at.bofh.it> <s9YZk-7vE-37@gated-at.bofh.it> <s9YZk-7vE-39@gated-at.bofh.it> <s9YZk-7vE-41@gated-at.bofh.it>
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I have the following issue (seems to be common although my details seem to
differ):

1. I recently registered a new domain as WWW.whatever.org or whatever.

2. Postfix gets installed.

3. "Internet site " is enabled fqdn added.

4. Email cannot be sent out to my Gmail address since it magically "times
out" when contacting the servers (even though telnetting to mine and
Gmail's works fine at port 25)

5. In theory thus should mean that they aren't blocking 25, and it should
work.

6. In the core wiki for Postfix I have the MX record of my server updated
from the registrar to mail.whatever.org (pita since it's dynamic and not
static).

7. I want to avoid using gmail's smtp and comcast's servers since I'd love
to host this on my own.

How can this be accomplished in Debian (not Ubuntu, or something else)? (I
get irritated at Ubuntu specific explanations {which usually don't work}
getting all the search results)

Any help would be appreciated as I spent ~3 days of work and wiping the
entire OS in case I went wrong somewhere.

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Getting fqdn, postfix, Comcast to all play nice together "John T. Haggerty" <jpcookie@gmail.com> - 2016-08-25 11:20 +0200
  Re: Getting fqdn, postfix, Comcast to all play nice together Mark Fletcher <mark27q1@gmail.com> - 2016-08-25 14:00 +0200
    Re: Getting fqdn, postfix, Comcast to all play nice together "John T. Haggerty" <jpcookie@gmail.com> - 2016-08-25 20:40 +0200
      Re: Getting fqdn, postfix, Comcast to all play nice together Lisi Reisz <lisi.reisz@gmail.com> - 2016-08-26 12:50 +0200
  Re: Getting fqdn, postfix, Comcast to all play nice together Jochen Spieker <ml@well-adjusted.de> - 2016-08-25 22:00 +0200
  Re: Getting fqdn, postfix, Comcast to all play nice together メット <mett@pmars.jp> - 2016-08-26 14:20 +0200
    Re: Getting fqdn, postfix, Comcast to all play nice together "John T. Haggerty" <jpcookie@gmail.com> - 2016-08-27 01:40 +0200
      Re: Getting fqdn, postfix, Comcast to all play nice together Mark Fletcher <mark27q1@gmail.com> - 2016-08-27 03:10 +0200
        Re: Getting fqdn, postfix, Comcast to all play nice together "John T. Haggerty" <jpcookie@gmail.com> - 2016-08-27 05:20 +0200
  Re: Getting fqdn, postfix, Comcast to all play nice together emetib <chadbrabec@gmail.com> - 2016-08-27 01:10 +0200
    Re: Getting fqdn, postfix, Comcast to all play nice together "John T. Haggerty" <jpcookie@gmail.com> - 2016-08-27 01:40 +0200

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