Spammers often manage to capture email addresses from websites. If they have captured yours, they send you direct emails (mass mailers, mailing thousands of users) . Their software is made so that the use the email address of the victim (you) as sender also, because they know that this way probably your email client will not reject it.

Nothing to worry about, apart, obviously, the fact that you need to delete these mails.

Andy, pics linked to email addresses DO get captured Through the html code of the page). The only way is something like Dynamic Drive's Emmail Riddler that transforms the characters in ASCII equivalent.
Even so, manually, the email address can be captured, as you understand, it is enough clicking on th image.

A contact form is the most secure way, but, of course, you also need to take the email address off the site. And Google doesn't like sites without contact (email) details

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