Actually, my husband's company didn't block it intentionally--the first day he was there, it was already blocked, and they unblocked it at his request. (He does a fair amount of web browsing--ahem, not all of it work-related--and mine is the only site he's come across that was blocked.) So *something* got that IP on the blocked list before he even got there, and it was probably not my site, which has little more than family photos on it so far.
Thank you for the URL to confirm it's not on any blocked lists, by the way...it may have to remain a mystery. However, it's unnerving that of the approximately 10 people who know about my website, and the limited number of people I send email to, 2 have had problems.
I don't have all the details on my mom's email thing yet (getting accurate details about what she did or didn't do will be excruciating, as anyone who has dealt with a computer-illiterate parent well knows), but I was working under the assumption that her ISP installed something like Spam Assassin which was changing the subject line, and the ISP-configured mail client automatically refiled those messages. Completely possible that she *did* manage to do something to killfile me all by herself, but I am still curious about my original question:
Any way to get a dedicated IP without a dedicated server?