The last week, I've been getting this kind of emails to addresses that I don't use:
Dear Sir, Madam,
For security reasons and as part of our ongoing fight against spam, it is our policy not to accept e-mail from unrecognized outside vendors.
You are receiving this message because it is the first time that you have sent me an e-mail message.
To ensure that your message is delivered to me, simply : click here to forward the e-mail.
This identification step needs only to be completed once. All your future messages will come straight to me.
Thank you very much for your help in the fight against spam.
I suppose it's just a trick to verify that email addresses are in use, or even to solve some captchas. Is there any program that actually does this, or can I safely ignore the emails?