We have run our servers with a decoy, our MX records have been like this
for 10+ years:
mx0.example.com
mx1.example.com
mx2.example.com
mx1 & mx2 are real servers. mx0 is nothing, it points to an IP address
that is controlled by us but there is no server.
The concept being that some spammers at
The other day I was thinking it would be cool if you could detect
legitimate replies to mail I send.
Everyone gets spam with subjects like this:
Re: some type of trash subject
Obviously those are not replies to a message you sent.
That got me thinking of ways to authenticate a legitimate reply
