email hygiene
n. Principles or practices that reduce spam and protect a computer from viruses and other threats embedded in or attached to email messages.
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E-mail hygiene, storage and policy management, which have been largely ignored, have recently become business imperatives, according to industry research firm Meta Group.

The major thrusts of e-mail hygiene are spam management and security from viruses and other e-mail threats, including hacker attacks.
—“Practicing good e-mail hygiene,” Computing Canada, September 05, 2003
Higgins said the viruses probably will be more of a nuisance than a problem. But he recommends visiting anti-virus Web sites and trashing e-mail attachments from strangers.

"It has nothing to do with the year 2000," he said. "Good e-mail hygiene says you don't open attachments from somebody you don't know."
—Christie Appelhanz, “Y2K not only concern in new year,” Topeka Capital-Journal, December 25, 1999
1999 (earliest)
With virus activity reported up over the last three months, there's no guarantee that any measure you take will completely protect you. But if you practice good e-mail hygiene, odds are that you'll stay safe.
—Kevin Jonah, “Catch viruses,” Government Computer News, June 01, 1999