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Rule to deal with fake "reply-to" field

cn flag

It would be impossible to be anymore of a newbie than I am dealing with SA and rules etc..etc.. I am having an issue and have searched high and low on the net and I get some info that sort of seems to answer the question, but to this point nothing is working to fix my issue... so... please help, anyone?

One particular problem I have been having with a client site is a spoofed "reply to" input. Actually let me show you an example.

From: rh60 [email protected]

Date: June 30, 2021 at 3:56:29 AM EDT

To: [email protected]

Subject: New Message From Real Domain

Reply-To: ""rh60"" [email protected], rh60 [email protected]

If you look above you will see I have changed the client's actual domain to "realdomain.com" for this email. But in the "FROM" field it is showing a legit email address from within their domain. The "TO" field is also legit.

The only thing that is clearly wrong is the first entry in the "REPLY TO" line you can see the spammers actual email or a placeholder.

My question is can I set up a rule that would filter a message like this as SPAM and have it not go to the client? For this ONE particular client as they would NEVER send an email with TWO reply-to addresses in one email.

I am completely clueless as to how to go about this, can I put some sort of wildcard in a rule so if there are TWO addresses in the reply-to it is spam? Can the rule be set PER domain... sorry not joking about being new.

Thoughts?

Paul avatar
cn flag
There is a difference between marking as spam and blocking/discarding. Which are you trying to achieve?
BKKcanuck avatar
cn flag
Oh sorry about that, my complete lack of knowledge shining through. I would like in a perfect world to just block/discard them
mangohost

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Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.