@Kevin Mahoney 

1) You can block email address via user account by clicking email account drop down menu will display block the        sender ,  The blocked email going to junk folder 

2)  Check your specific email spam settings , check & compare incoming spam mail weight and move / delete spam high emails 

There are a few ways to achieve this e.g custom Spam check of the FROM header at the server level or content filtering rule at the domain level but rather than targeting a specific email addresses, as the spammers will change this, I can help you look for wider configuration issues/recommendation that would stop this type of Spam or create more specific rules targeting, for example Chinese from addresses (.cn), if it's more appropriate.

Looking at your post it appears the corresponding SMTP log entry would have sender(1) as info2@yahoo.com and sender(2) as eva123@deluxeav.com.cn so DMARC would not have stopped this but if you could confirm the sending host and IP address.

>>There are a few ways to achieve this e.g custom Spam check of the FROM header at the server level<<

Yes, I would prefer this. Ideally it would be nice to have the ability to use wildcards so I can just plain stop some country domain extensions. We have our own dedicated server and all sites are our own. So it's not like we have server clients that would be spamming from our server. I'm only worried about the inbound spam.

Suggestions?

Thanks!

To target sender(2) (aka MAIL FROM) create 'Settings/Antispam/Spam Checks' - New

Custom Rule

Rule Name: MAIL FROM .cn

Rule Source: Header

Header: From

Rule Source: Contains

Rule Text: .cn> 

Weight: 30     (adjust to your needs)

Enable Spool Filtering: Enabled

I wanted to follow up with this as it has totally stopped the highly aggravating spam.

The settings I used:

Name: SPAM RULE HIGH
Rule Source: Header
Rule Source: Wildcard
Rule Text (one per line):
info*@yahoo.com
*@deluxeav.com.cn
Weight: 40
Match Multiple: Disabled
Enable Spool Filtering: Enabled
Enable Outgoing SMTP Blocking: Disabled

thanks!