Email clients calculate how many of your subscribers open your emails, click links within your emails, unsubscribe, or are inactive. If you constantly send to contacts who don’t want to receive – and complain about – your email, your sender reputation may decrease to the point where your emails are automatically marked as junk, or worse: blacklisted.
This is why it’s so important to practice good email subscriber list hygiene. Remove invalid and duplicate email addresses and switch off any unengaged contacts.
Factors that often cause bad data are:
(e.g. info@, marketing@, support@, webmaster@, etc).