How to exclude column data

[raym0nd]

Hi,

I am using Gmail to send a large number of emails regularly.

Usually I compose a new email and sent to a All Contacts.

However, sometimes I wish exclude certain contacts from All Contacts.

The exclusion email list I have is usually a CSV or a column in excel.

What is the best way to do that to do the exclusion? I am wondering is there a gmail features to do that or I need to use excel formula/macros?

I have attached a sample excel sheet for reference.

Please advise.

Thanks