I just got a couple of emails about a FormMail script error that are different than what I usually get. I'm just wondering if I should be concerned. This is what they contain:

The following error occurred in FormMail :
Server attack "Special Fields Only" detected. Your server is safe as FormMail is invulnerable to this attack. You can disable these messages by setting ALERT_ON_ATTACK_DETECTION to false in FormMail's configuration section.
More information:
Special field "mail_options" contained an email address

email:
realname:
Which is fairly normal, but what's odd is the subject of the emails. One of them was:
FormMail script error (improve your online reputation)
And the other:
FormMail script error (Get noticed)
Just wanted to see if anyone else has gotten these or if I should be fixing anything?

Thanks in advance!