Task 'email@example.com sending report error (0x800cc67) the server responded 421csmtp2.tb.ukmail,iss.as9143.net cmsmtp virgin media has blocked your connecting IP too many bad emails have been sent
Thanks for coming back with that information. The error message says it all and confirms what I first thought. Virgin Media are blocking emails sent from your home IP address presumably because suspicious traffic, possibly from malware on a device on your network has been detected. You will still be able to send VM emails from your Webmail account, just not from Outllook or any other email app.
That error message used to go on to say "Visit https://netreport.virginmedia.com/netreport Section: Email Sending Errors to request delisting"
You could try using that link and then selecting and then clicking 'email sending errors' in the drop down menu. You can then copy and paste the full error message into the 'Log evidence' space and fill out your details.
Others have done that and had the issue resolved.
Deleting and reinstating the account in Outlook will not resolve that. The only thing that will is to get the matter investigated by the appropriate team in VM and have that block removed. Hopefully sending the request from VM's Netreport page (as above) will initiate that process,
Hope that helps.
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