I asked Rob again and he says he has gotten no responses from CL, and that no Fastmail user has filed a support request, so there isn't much else he can do without a specific user account to troubleshoot. There are no bounces coming back from CL, and evidently some Fastmail users have no problems with using CraigsList. I haven't used it in such as manner, so can't give you more information.
So file a Fastmail support request if you have such problems.
Bill
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