Since yesterday all my VM email accounts won't send from my email clients (Thunderbird - 2 versions on two different computers, Mail - the Microsoft app on Windows 10 and K9-Mail - an app on Android). Receiving is OK. Sending via webmail works (it used not to but VM did something and now that is working). Non VM emails send OK. IMAP server settings are correct (and unchanged for years).
Any suggestions? VM refuse to believe the fault is their end (though their premium support line said it was)
You can check your listing yourself but there is no point requesting removal until you have found and deleted the spambot. https://www.spamhaus.org/query and type in your external IP you can gets this my typing "whats my ip" into google.
If you are running Hola VPN Free, then note But Hola Free VPN is anything but a VPN.
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I cannot believe just how quickly you pointed me in the right direction. It was, as you suggested, it was a VM305 error caused by my IP address being listed on Spamhaus. Before I posted here I had been on the phone, holding, for VM for 27 minutes, then got through to a technician only to have the call dropped after 3 minutes. Second time I called in it took 35 minutes to get through but the technician was absolutely clueless. His supervisor had a better understanding of the issue but couldn't help so he put me through to their Premium Support (paid for) line who realised the problem was not with Thunderbird and K9 Mail and Microsoft Mail on three separate computers but they still couldn't solve it. The technician raised a ticket with VM but admitted he had no idea when someone would look at it. You answered with a really helpful solution within 5 minutes.
Next time I have a problem I will give VM's awful customer support a miss and come straight here.