| I am trying to stop the ever increasing flow of  https://en.wikipedia.org/wiki/Email_spam#Related_vocabulary" rel="nofollow - Bacn , all these newsletters, discounts and social mail is a bit much. 
 I can stop a lot of it, but some I have not figured out how to stop as the message looks to legit. 
 Is there any way to filter on the HELO-Domain? 
 I see in the headers an entry like this: 
 X-SF-HELO-Domain: bmmpl3204.jpx1.emssnow.jp 
 The domain emssnow.jp is a Bacn sender, looks like  http://www.bbc.com/news/technology-21830739" rel="nofollow - Bacn was identified several years back as being a major problem  but I'm just getting around to attacking it more aggressively now. 
 Adding the ability to filter on the HELO domain would be a big help in the fight against the Bacn. 
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 I am a user of SF, not an employee.  Use any advice offered at your own risk.
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