This has been a point of contention for us for years. Our office has multiple network attachments, using Comcast is part of it. This is the main office, not the home office. Latency on the link, as measured by DNS pings, have always been fairly high, in the multiple 2-3ms region, as compared to our other connection (using a different provider and a different technology) which has been consistently, 0.5ms for the last 2 years.

We have a business account at home. I work enough from home that I can easily justify it. Fixed IP, and I run services, mostly to back up my office services. One of those services is SMTP. I’ve been running an SMTP server, complete with antispam/antivirus/… for years. Handles backup for some domains, but is also primary for this site. This is allowable on business accounts. Or it was allowable. 3 days ago, they seem to have turned that off.