[Exim] blocking fake yahoo and hotmail

A friend wrote these two rules for addition to the rcpt acl. They
seem to work rather well. A good portion of spam says it is from
yahoo or hotmail, so these rules keep them out.

drop   message   = Faked yahoo, so you must be spam.
   log_message   = Fake yahoo
           senders   = *@yahoo.com
         condition   = ${if match
{$sender_host_name}{\Nyahoo.com$\N}{no}{yes}}

drop   message   = Faked hotmail, so you must be spam.
   log_message   = Fake hotmail
           senders   = *@hotmail.com
         condition   = ${if match
{$sender_host_name}{\Nhotmail.com$\N}{no}{yes}}

Rossz

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Fogalmam sincs, mi van ide írva.