There was a temporary problem while delivering your message to ************@o2.co.uk. Gmail will retry for 47 more hours. You'll be notified if the delivery fails permanently.
So how to stop this ERROR Prompts from kept on sending to me from my Server please?? In particular apparently GMail also involved which I have no clue at all!. Alternatively how to "delete" sending this C.C e-mail again in Thunderbird and/or GMail as a mean of stop addressing to this Invalid e-mail address??.
Current ISP: Plusnet FTTC