我觉得成龙说的不准确,按道理来说如果房主在合同里写了他的email,那么往这个email里寄信就已经算是notice served了,是法律上承认的。比如我的合同里就有这一句: Landlord’s contact details
If you need to contact us at any time, please use the contact details below (unless we tell you that these details have changed, and provide new details). We agree that notices given in connection with this agreement which are required to be given in writing may be served on us at the email address given below
“If you decide to serve a Notice by email you need to make sure that you have proof that the recipient has received and read the document. You could ask the person to confirm receipt or set up your email account so that you receive notification once it has been read.” http://housingrights.org.uk/news/written-notice-quit-valid-if-served-email-or-text