17 Jul
2017
17 Jul
'17
8:19 a.m.
To my mind the easiest way would be not to re-invent the wheel and just leverage an existing email list verification service like https://neverbounce.com/
Validating 250,000 email addresses with that would cost you $100
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Alan Bourke
alanpbourke (at) fastmail (dot) fm