One of the most important things that you can do to ensure good email deliverability is to add email deliverability test accounts to your mailing list. Fortunately, adding deliverability test accounts is also one of the easiest things that you can do! You should do this by creating one or more test accounts with each of the major free webmail hosts, such as Gmail, Hotmail and Yahoo. You can do this by using your "company name" as your standard email deliverability test account name.