Over the last week there has been s marked increase in Spam email making it into my inbox (10 to 12 a day). I am marking them as Spam but a very email is for a voucher and seems to come from a different address. I've tried blacklisting the emails but again every address is different. Is there anything else I can do
If the email address domain (part after the @) is the same then consider creating a filter rule similar to the following (or similar rule if your email client supports filtering): Do make sure to change Apply rule if all condition are met to Apply rule if any condition met if more than one condition is created.
Filter rules are not an efficient method for handling more than a few missed persistent spam emails; anything more and you need to either hope Virgin Media get a handle on the issue or look for an email service with better spam handling.