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I built this primarily for myself, the main advatages are:

* Avoiding getting junked/rejected due to:

   * Missing/invalid SPF record

   * What would the sending domain be, if not set could easily be rejected

   * From a dynamic IP

 * Port 25 may not be open (it wasn't for my case)



I set up my servers to use Google's SMTP, then proceed to use inbuilt tools. So only port 25 (or whatever the TLS equivalents) blocking is a problem




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