You can blacklist each offending e-mail so that in future it goes into junk and you can erase; or, if e-mails arrive from a single or common source, you can set up a filter to block them. To do both of these actions, you need to sign into your webmail account.
To blacklist, I think you open the e-mail with webmail and select the blacklist option.
When I had lots of spam from .eu addresses, I was advised to block all e-mails from .eu addresses. To set up a filter, I think you go to settings within webmail and select e-mail. You add a filter there.
If you search the topic spam or junk mail, you will find many other people have had these issues; and some threads have detailed solutions from VIPs.