Question

Why is it considered bad manners to leave the Subject field blank?

Answer 1

Question: Why is it considered bad manners to leave the Subject field blank?

Answer: it would be rude to leave it blank it would make the person think you were being rude and when you leave it blank your email is at risk of being spammed

Explanation: this is bad it putts you and your email at risk

question answered by

(jacemorris04)

Answer 2

It is noted as so due to the fact the reader would like to know the reasoning behind the message. Following that the bots used to monitor emails for scams, spam, or viruses typically send off empty subjects as a spam.