Unfortunately, there isn’t an end-all, be-all answer for that question. It varies depending on your email list and recipient preferences. To figure out what works best for your readers, try different days and times and analyze the results.

Building an Opt-In List, Building Relationships
If you aim for success, you must do everything within your means to achieve that. You just donít go on sitting there in your house complaining about not getting as much profit as you expect.