How long is an email address valid?
This of course varies on a case-by-case basis. However, it is generally expected that an email database of customers will show 1-2% turnover from each month as people change jobs, move or switch Internet providers. This is a great reason to make sure your append provider has data that is up to date and that they offer a rebate for any bounces that occur on your first blast. Dataappenders offers a guarantee of 90 days on the deliverability of the appended emails from the date of delivery of the appended file.
