Trying to validate email... verbose logging definitely shows the source of the error. Why on earth would it try and send that "MAIL FROM" command????
2017/08/05 10:26:16 CURL: header_in 235 2.0.0 OK Authenticated
2017/08/05 10:26:16 CURL: header_out MAIL FROM:<mbradford@smtp://mail.insightete.com:25>
2017/08/05 10:26:16 CURL: header_in 553 5.1.3 <mbradford@smtp://mail.insightete.com:25>... Colon illegal in host name part
2017/08/05 10:26:16 CURL: MAIL failed: 553
2017/08/05 10:26:16 CURL: header_out QUIT
2017/08/05 10:26:16 CURL: header_in 221 2.0.0 sp4066g.serverpronto.com closing connection
2017/08/05 10:26:16 CURL: Closing connection 0
2017/08/05 10:26:16 CURL: TLSv1.2, TLS alert, Client hello (1):
2017/08/05 10:26:16 CURL: ssl_out
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