Sounds like your mail provider is not sending for some reason. It is common for mail to yourself not to appear, but again it is mail provider dependent.

It this case, not just my own e-mail address gets eaten, every address in every list gets eaten. This whole process has been working swimmingly for 3 years until last week. I've even tried another SMPT server. I'm not sure e-mails bearing lists are getting that far through this comcast fubar.

Comcast. Those guys have an impenetrable set of anti spam rules. Impenetrable in that they will not tell you what they are or explain why your caught up in them. But they have very strict rules about how many recipients to a mail and how many mails per day, and it is not a lot.

Might I suggest mail merge as an alternative. Then it is one mail one recipient https://addons.mozilla.org/en-US/thunderbird/addon/mail-merge/?src=ss

Or better yet use another mail provider, like Gmail, Yahoo, Hotmail or GMX

I decided to try mail-merge. It installed successfully. I formatted the desired e-mail with the destination address set to Bcc with one of my address lists filled into the bcc field. I selected file-> mail merge, filled in appropriate choices and pressed OK. Got error message "No recipients were specified. Please enter a recipient or newsgroup in the addressing area." I constructed a csv file using tools -> export from the address book and tried the same e-mail with a blank bcc field and csv choices in the dialog box. Got the same error message. I must be doing something wrong (again.)

You don't need to use, and shouldn't be using Bcc: in mail merge. Each message is addressed to just one recipient. Since that message is uniquely addressed there's no point or value in hiding the addressees. So you just use To:. Your CSV file attempt sounds better suited, but it can be very picky about the CSV file structure, using quote marks to include spaces and so on.

I don't have any real use for mail merge myself so can't speak for its usefulness or performance. When I have tried even small mailings to just a few of my own email addresses, it seemed a bit fragile and prone to stopping and getting stuck, leaving you with no clear idea of which messages had been sent and which needed to be attempted again.

The mail merge built into the open office/libre office suites seems to work rather better.

Thanks to some coaching from Zenos, I got mailmerge to go through its paces. It needs the mail list from the address book to appear on the "To" line and then it kicks off a separate email for each entry in the address list. Unfortunately, Comcast is also on to this method of distribution and dumps every bit of the output in the bit bucket. Comcast seems to have a mission to rid the world of what it deems to be spam. I guess I will have to resort to using a web based vehicle like mail chimp to get my newsletter off the ground again.