This is just an FYI post if you are getting undeliverable emails via smtp.hmc1.comcast.net - Apparently at least one of their servers (76.96.53.6 - omta01.westchester.pa.hmc1.comcast.net) has found its way onto some blacklists. First it was on blacklist.lashback.com - That got fixed, and now it's on 4 more:
http://mxtoolbox.com/SuperTool.aspx?action=blacklist%3a76.96.53.6&run=toolpage
Comcast knows about it, but it's taking some time to fix...
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