So it was down for a week.  Then, when it came back up, things seemed to work fine -- until I tried to reconfigure my Thunderbird POP settings, and suddenly got a warning about the security certificate pointing to a site that wasn't "ruggedinbox".

Not seeing the certificate issue mentioned here in the days since, I've begun to wonder whether it's something flying under the radar, maybe slipping past those who continued "business as usual" under their previous settings.  So, in the interim, I opted to use the webmail interface.

Unfortunately, since yesterday, the website appears to be down again, at least for me.