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Reads the one line your email is judged on: where it gets cut off, the merge tag you forgot to fill, and the patterns that mark it as one to delete unread.
This check is part of the membership
Members run it on their own pages, with every other check, the decision tools and the courses.
A subject line is the only part of an email most people ever see, and it is judged in an inbox that shows about forty characters on a phone. The preview text beside it is a second line most senders leave empty, so the inbox fills it with whatever the email starts with, which is usually 'View this email in your browser'.
Where a subject gets cut off is measured in pixels and every inbox differs, so these counts are a guide rather than one client's exact truth.
