Hi there awesome email community! I wanted to do some due diligence on a question we had come in from a customer so figured asking the community for their thoughts would be a good start.
Basically, we received an ARF report from an ISP so we take that as a recipient complaining against a message from one of our senders. That recipient then reached out to the sender swearing up and down that they never complained. My question is, is there anything that could inadvertently trigger a spam complaint for a recipient without their knowing? My hunch is some sort of mailbox add on or something to that extent but wanted to hear others thoughts. Of course, the recipient may have accidentally clicked "spam" or "junk" and they just forgot :) Best, Nick Schafer Technical Account Manager, Mailgun <http://www.mailgun.com/> Add me on LinkedIn <https://www.linkedin.com/in/nicholas-schafer-6a0a3753/>
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