Developer's email setup tool fails three ways on a live website before fixes
The developer built a free add-on to help small business owners set up email authentication settings that keep messages out of spam. Tested on a real website for the first time, the tool wrongly reported a correctly configured setting as missing because its validation rejected a leading underscore. It also flagged a correct setting as wrong due to strict ordering and extra-line matching. A third issue, where pasting a value for an unlisted provider would create a duplicate setting that cancels protection, was also found and fixed. After the corrections, all three checks passed on the live site and a test email landed in the inbox, and the add-on is being released free for WordPress users.
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