What is the importance of Subject headline in e-mail? How do you feel when you receive an email without any subject/headline?

Thanks 

That is let me feel uncomfortable just like when you talking with invisible ghost, anyways it is unprofessional manner to communicate, person who intend to send an e-mail official - unofficial should review the content,subject, persons in loop To,Cc.... this is A,B,C for anyone wants to send an e-mail 

Regards 

We get a hundred of emails every day, and a lot of them are never opened. People are inundated with boatloads of information – more than ever before in history! But we don’t have more time to soak it all in. The chances of your email being ignored are pretty high – unless of course, you have a rockin’ sockin’ subject line.

our subject line is your first (and maybe your last) impression on users. In many ways, your email subject line is more important than your email body. After all, a great newsletter is worthless if it never sees the light of day.

The subject line of an email is the first thing to gain the attention of the recipients. It often becomes the deciding factor for an opening of the emails. An email should always have a good and convincing subject line. Emails lacking subject line is either ignored or delete.

An e-mail without a Subject line would make me feel  that I ‘m disrespected by the sender.

The importance of the subject or headline in an e-mail is that it gives you a head start on what the e-mail is all about. If there is no subject or headline on the e-mail, it will look like a spam.

I agree with Mr. Shukri mim views