and privacy

Today I was crawling through my mail logs for various reasons.
I was really surprised, that I saw a mail to a dedicated mailaddress which I'm using for communication with I was short checking, if this mailaddress is anywhere published at, but couldn't find anything.

A one liner over the last week of mail logs:

# zgrep performancing /var/log/* | grep clam | wc -l

For a address only used for communicating with one organization (used as contact mail address) this seems a bit too much traffic and this are only the mails, which was accepted by the MTA. So the questions comes to my mind .... what happens with the addresses at Maybe I missed something?