Head back to your Gmail window. Now, compose a message that you might use frequently, like “Thanks very much for this! I’ll get back to you as soon as I can.” To set up a canned response, click on the dropdown arrow in the lower right-hand corner of the Compose window, and choose Canned responses, followed by New canned response. You’ll have to name the response and save it to make it available.
When it comes to deciding how to craft that perfect subject line, there appears to be really only one area to avoid: the subject line of 60 to 70 characters. Marketers refer to this as the “dead zone” of subject length. According to research by Adestra, which tracked over 900 million emails for its report, there is no increase in either open rate or clickthroughs at this 60-to-70 character length of subject line.