I’m sure you have received emails from others that did not format correctly in your email viewer or went straight to your spam folder. Here is how to test your emails before sending them to your main list.
Get email accounts with Gmail, Yahoo, Hotmail/Live/MSN. Also make sure you have Thunderbird and Outlook email readers.
Now take all the email accounts you created and add them to a list named test or something similar.
Now each time you have an email to send out, send it to this test list first. Then check each email account to see if it went to the spam folder or if the formatting looks wrong.
This will keep you looking professional to your list subscribers.