On Wed, 2019-02-20 at 10:16 -0700, S. Bob wrote:
They can email me at other addresses but
not the 'migrated' address. I'm not sure how to even start debugging this...
[Definitely OT, but anyway ...]
Do they get an error message back? Is their mail being dumped by a spam
filter? Does Fastmail log messages sent to your address?
poc