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Private eMail servers like Exchange or Postfix must be setup with a static IP in order to work with pulic mail providers such as Google, Yahoo, Hotmail etc.
The reported errors are usually something like "invalid reverse DNS pointer". The solution is a static IP, dyndns won't work.
Of course, could be a pain for incoming email. IME the IP changes so rarely though. It may be worth setting a low ttl on the DNS entry for the hostname that you use for your mx.
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Re: Static IP
