This is a business development tactic I borrowed from my friends: schedule your
e-mails for anywhere around 7:40AM - 8:20AM, in the time zone of the editor.

Most people have the habit of reading their e-mails first thing in the morning; so they are bound to open yours out of curiosity.

If you don't know how to schedule e-mails, check out Boomerang for Gmail and
install it. It is gold.