They can also just 'harvest' your email address from anyone who includes you on a distribution list and doesn't use the BCC (Blind Copy) option. ie all the addresses of those receiving the email is visible to all.
I do a regular Friday Funnies email at work and I BCC the list so nobody knows who else is receiving it.
Just good practice generally speaking unless it's 'conference' type of email and you are asking for replies\comments in the group.
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