Following up with what Norm is saying, Comcast subscribers should consider changing their subscription setting to "nomail", and reading MDOsprey at the archive site.  This way you can still post to the list, your email inbox doesn't have quite so many items, and you won't be automatically unsubscribed by the system.  This is what I have been doing for many years; in fact the last time I went off nomail was 6 years ago.  
Best, 
Rob HiltonSilver Spring