During our last email campaign we got 6% of undelivered emails. This happened in a times span of only 3 months after the previous campaign and clean-up.
This makes clear that many people have changed companies or have been fired.
And results in even more time consuming work to keep the email data base up-to-date as not only the people that are no longer with the company need to be removed from the data base, but new contacts need to be searched and found.
Maintaining email data base
As so many people are no longer with their company where have they gone to? Of course you could investigate in each of them using LinkedIn, but most people will only update their status once they have found a new job.
The quest is in finding the person who replaces and is in charge. If there is someone who replaces.
In the end the more recession, the more layoffs, the more work to be done on the email data bases. Once the the recession is over the trend will change again in hiring which again will require more maintenance to the email data base.
This is the Perpetual Mobile of the email data bases.