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Whitelisting by DKIM signature is another account-specific method (and what I recommend above all else when it's available).
thanks Sanford -- I found your recommendation in another thread (now that I had better keywords to search) and found your recommendation for
Ask them to whitelist DKIM-signed email From: your domain with the selector "m1" (m1._domainkey.example.com).
I'll see if that works.