Got this message back from my ISP re some comments bouncing back to you:
Thank you for forwarding in the bounced reply. From your email it appears that the IP address used to send the email has been blocked by Spamcop. I have checked that IP address and it is not within the Netspace IP range but rather an IP address that is used by Yahoo. To have that IP address unblocked by Spamcop you will need to speak with Yahoo and inform them that their IP address has been listed in Spamcop and any emails sent will be subsequently blocked.
Can anyone tell me what Yahoo has to do with it? Blogger is not Yahoo, and at least one of the "bounced" people (e.g. Alice) does not have a Yahoo connection, at least that I can tell. Why wouldn't ALL emails bounce then? And this Spamcop seems to be a bit of a buttinsky (whoa, haven't used that word for a long time). I'd appreciate any enlightenment you might have. Della, YOU might know about this!
I have lowered the level of tolerance of my anti-spam software, so hoping that will help too.