Blocking emails from a particular server

[#1]

Hi,
I have used the Yahoo! email server for "years" and have set up my emails to block spam messages from particular servers.
Now I am using the server at Plusnet and I am getting a lot of spams listed as returned.
How can I block emails on the same criteria as my Yahoo account.
Thanks
David E.

[#2]

If I understand what you want to do correctly you can do it here
https://portal.plus.net/my.html?action=myemail&s=1&redirected=yes&?membermenu=emailsettings
Then Manage My Mail
Then Spam and add them to the blacklist

[#3]

Hi OldJim,
Not quite what I want to do - this allows me to block (blacklist) specific email addresses. Unfortunately some spam servers change email address on each message sent. what i want to do is block all email address from specific servers.
Thanks for reply
David E.

[#4]

You can block a domain as well as a specific email within that domain or isn't that what you mean by a server http://www.plus.net/support/security/spam/spam_protection_guide_5.shtml