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Hello Bobm, to assist we would need more information to your email uid.
1. What is the domain of your email address using smtp.hmc1.comcast.net?
2. Can send you send from webmail?
note* please post only your domain name in this query and not the entire email address.
This appears to be possible filter issue on a firewall. I say this because your setting appears to correct with POP3, able to send from your work location with it and the webmail works as well.
Can you map out your network for the community?
Modem (IP-Gateway, Surfboard, etc) -> Router (Netgear, Linksys, Cisco, etc) -> CPEs (Computers, printers, etc)
Additionally if you are using a modem have you ever connect directly to it for a test?