I just received an email from groups.io to say that, because one of their servers had been labelled as a spam sender by anti-spam service spamhaus, some members of the group will have to reverify their email address. I have no control over this and I presume it happens automatically. So if you get an email asking you to reverify please do so. It appears the vast majority of members will not be asked to do this but if you are asked please do it quickly otherwise you will be disabled on 28th Jan - yes I know it's short notice but I only heard myself less than an hour ago.
Cheers
Ian (Group Owner)
Ian Bell