Writing Lengthy Ones
With new wave of technology, people have switched to smart phones skipping the use of PCs. Considering the average dimensions of the mobile screens, they display only 5-6 words as the subject line. To get the message across successfully, better frame short and precise subject lines.

Being Ambiguous
Subject should make your word known what your email particularly is about. Leaving the recipient wondering about the matter, sure have chances of your email not being opened. Including sensible and analytical keyword in the subject lines would make your mails easy to track in future.

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