Murray's answers are largely correct. I'll fill in some additional detail below.
On Fri, Feb 17, 2023 at 11:10 AM Michael Thomas <m...@mtcc.com> wrote: > 3. Do senders filter outbound traffic for spam? > 4. Do spammers who get a piece of email signed by a sender also send mail to target domains to see if it passes their filters? Yes and yes. The testing behavior in #4 is also used on outbound filters. > 12. Do spammers provide an unsubscribe link which is typical on normal email blasts? If not, is that unusual and/or against the rules of the bulk provider? If so can the sender keep track of that? > 13. Can senders verify that opt-out links actually work especially for new accounts? You're giving DKIM replay spam much more credit than it deserves. It's bottom of the barrel stuff - scams, fraud. It has no use for an unsubscribe link. Also, nearly all email marketing platforms provide an integrated unsubscribe link as part of the platform functionality; some go so far as to prohibit 3rd party unsubscribe links entirely.
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