Here is a list of Free Email Accounts you might want to join for various reasons
For instance :
You may not want any email addresses for your domain
You may want an external email address for signing up to services that may spam you.
You might one another for social media accounts only.
it is a god idea to avoid any email services that are not widely known and well established, you want want them to disappear on you or get shutdown without warning.
Here are 3 of the longest running free email services that are not likely to disappear.
GMAIL
https://gmail.com
HOTMAL
https://hotmail.com
Yahoo Mail
https://mail.yahoo.com
If you wish to run a newsletter the best option in our opinion is MailChimp
https://mailchimp.com
