Outlook 2010: Not Blocking "on behalf of" Senders?

[Gongalong]

Hi folks,

 

I'm getting a variety of spam that's one email address sent on behalf of another. The first email address seems to be one of a small group of domains e.g. mcsv.net, which I'm guessing is some message sending service.

 

I've added these as blocked domains in junk email, yet I still get emails.

 

I'm guessing that Outlook's junk mail filter may be ignoring the first email, but just curious if anyone knows for sure why this is happening.

 

TIA

[X-13]

The first email address seems to be one of a small group of domains e.g. mcsv.net, which I'm guessing is some message sending service.

 

Pretty much.

 

MCSV | MailChimp

[Gongalong]

mcdlv.net is another one.