Howto stop ”crawlers” getting mail-id from WP -User-list?

Priccen — Sun, 19 Mar 2017 09:13:49 +0000

[ Moved to the Fixing WordPress sub-forum. ]

Hi
I made a mail-id into my mailbox just for testing Membership-2 function on my site.
I added a member to my site with that mail-id.
Nothing of that user, nor mail-ID could be found in my site, if you look with a normal browser.
A couple of days later I got spam to this mail-id.
Is it possible to hide users mail-id inside WP.
The mail-ID is only in WP-User list and Membership2 All user-list

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Howto stop ”crawlers” getting mail-id from WP -User-list?