When extracting data from the internet, and in particular email addresses, there is always the risk of capturing incorrect or no longer existing emails . This may not be a problem for many, but it actually is. In fact, having a mailing list that is not clean and containing several incorrect or non-existent addresses could create problems for the ” reputation ” of your IP or of the email address that you then use to send newsletters or email communications. Not to mention the problems that could arise when you load this “dirty” list on Email marketing services and see it rejected because it contains too many “fake” addresses.
A list of email addresses can be defined as “clean” if inside there is a percentage of incorrect or non-existent emails below 5%. This is the threshold that makes the difference for the quality of a mailing list. Having a percentage> 5% (also called a ” bounce rate” ) means meeting the problems mentioned above and the risk of having all your messages delivered to SPAM .