Thank you Supanet
For some time now, I’ve been frustrated in my attempt to email friends with Supanet accounts - I just get back bounces telling me that my mail host is blacklisted because of an earlier spam. I tried emailing Supanet’s abuse & postmaster, but guess what… my mails bounced back because the entire supanet domain was rejecting any mail from my server. And I couldn’t find any support options on their website that were usable by non-supanet customers.
I finally sorted it out today - emailed them from my Hotmail account (why didn’t I think of that before?) and they very kindly responded within about half-an-hour of my mail (if only more ISPs were so responsive) and said they would remove my server from their blacklist because they hadn’t seen any spam from it in a while. Actually, it wasn’t my specific server that was blacklisted, it was the entire /24 netblock, which is also reassuring was it means hopefully my machine is as secure as I’d thought it was.