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Where did you run across this term and what concerns you about it?
The term "e-mail sniffer" has several meanings, some of which mean nothing. The only practical application of a genuine "sniffer" is a bot that harvests e-mail addresses from ... well, anywhere an e-mail address may appear. They're little programs that "crawl" the Internet looking for e-mail addresses that are then loaded into a database and used as delivery lists for SPAM or other, similarly annoying purposes.
There is another form of "sniffer" that is bogus. This form of a sniffer supposedly can detect your e-mail settings and deliver content to you based on those settings. It doesn't exist. It can't.
So, there's nothing you need do to "detect" a sniffer.
If you got an e-mail, your e-mail address was already "sniffed" out there in the wide world of the Internet somewhere. The only defense against that is a quality SPAM blocker.
What did you receive, and why do you think it is a "sniffer"?
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