Fill in the blank: As a general rule, _________ subject lines improve open rates.

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QUESTION

Fill in the blank: As a general rule, _________ subject lines improve open rates.

Longer

Shorter

Funnier

Vague

The correct answer is:

Shorter

Fill in the blank: As a general rule, _________ subject lines improve open rates.
Explanation: We will update later. sincerely thank

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