verp
DELIVTERMS: The Monday series here on Spam Resource that defines deliverability terminology. Today, I’m going to talk about VERP: Variable Envelope Return Path.VERP (Variable Envelope Return Path) is where you encode the return-path address (remember that from last week) on a per-recipient basis, uniquely changing it for each recipient. If somebody sends an email to two people, you and me, your copy of the email message will have a return-path header with a one code in it, and my return-path header will have a different code in it. (You can find examples over on the VERP Wikpedia page.)Why? VERP helps email sending platforms (ESPs, CRMs, etc.) more easily track which email messages weren’t delivered — which ones bounced back to the sender.To understand how VERP helps with bounce tracking, we need to understand how bounces are communicated between senders and receivers. There are basically two ways bounces can be communicated…