I'm not sure if this is related to your problem, but your messages to 9fans are getting marked as spam by gmail. It complains that your address is failing verification for being from Yahoo.com.

On Feb 21, 2018 9:06 AM, "G B" <g_patrickb@yahoo.com> wrote:

I bought a new machine and can't get Plan 9 from Bell Labs to boot so I've installed 9front. It works great and is very fast. I've configured smtpd on the machine and it is getting messages but they're being blocked:

Feb 21 10:58:38 Disallowed yahoo.com!gary (sonic307-3.consmr.mail.bf2.yahoo.com/74.6.134.42) to blocked name mydomain.com!gary

Why am I getting blocked when receiving mail? I know I've missed something.

Thanks.