fix: enforce authorized address checks on send email only

[hf]

Moves the authorized address only check in the flow that sends the email, instead of in the email address validation flow.

[coveralls]

Pull Request Test Coverage Report for Build 11345250920

Details

• 10 of 36 (27.78%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.1%) to 57.082%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/api/mail.go	10	36	27.78%
<!--	Total:	10	36	27.78%	-->

Totals
Change from base Build 11334620572:	-0.1%
Covered Lines:	9523
Relevant Lines:	16683

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💛 - Coveralls