Weird database entry

I checked my registration table recently and found 3 weird entries. First, this is where someone registers a username and password. The password is generated but encrypted , and an email link must be responded to activate the account , which these were not but it kind of threw me anyway. This what was in the username field: Content-Type: multipart/alternative; boundary=6bc7cccbb294b179bd23781d7d300264 MIME-Version: 1.0 Subject: said ophie call once again he ammerjunker bcc: Deepawar@aol.com This is a multi-part message in MIME format. --6bc7cccbb294b179bd23781d7d300 Now, since my site is not totally operational and not really in production I gues I still should have put the validation code in anway :) However aside from my bad behaviour does this type of entry signify an attempt at an attack of any kind ? TIA Mark