Newsletter security source question

Well, technically the newsletter has to come from an email address, not a web one, so if it wasn't my own (we've done that for over a decade) we could simply use a dedicated "newsletter@techspot..." address, we've simply chosen not to.
 
'Thank You' Cycloid Torus and (head honcho) :D Julio. I raised the question because of Thunderbirds continual 'Blocking' warnings, also, in these ever distressing times of booby trapped emails, clarity before clicking 'Ignore' or adding an unknown to ones address book, is a sad necessity of our times.
 
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