Top Deliverability’s Blog
Spam Resource: ARC: What is it and why should you care?
- July 7, 2022
- Posted by: Top Deliverability
- Category: Industry News Spam Resource
Al Iverson just posted a brilliant blog on Spam Resource:
ARC (Authenticated Received Chain) is an email authentication mechanism, sort of. The point of ARC is to encapsulate a check of email authentication results and include it in forwarded mail.If I receive email at an address, then I forward mail to another address, authentication results are difficult for the mail server at the second receiving site to interpret correctly. SPF works on a “last hop” methodology, meaning that a server doing an SPF check can only check the server that just connected to it — making it incompatible with email forwarding, because email forwarding involves more servers and thus more “hops.” A DKIM authentication signature is supposed to be compatible with email forwarding, but there are enough glitches out in the wild — encoding problems, rewriting headers for forwarding (or adding headers or footer text for mailing lists) that it just doesn’t work perfectly 100% of the time. And then
Read the original here: ARC: What is it and why should you care?
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