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SENDING EMAIL INFORMATION
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This section is about information you need if you are going to be sending bulk email.
Setting up Google Postmaster Accounts for Monitoring Deliveries to GMAIL

(this was sourced at google, check here for latest info:  GOOGLE)  

What is the "msv1.invalid" domain and why am I having trouble delivering email?

The msp1.invalid domain is NOT REAL.  It was first implemented at outlook.com around 2013 as a "placeholder" and many organizations left it in their DNS when they should remove it. From Microsoft: The...