AOL’s marketing is so pervasive, it has snuck its way in to their bounce messages:
: host mailin-02.mx.aol.com[205.188.155.89] said: 550 We would love to have gotten this email to [email protected]. But, your recipient never logged onto their free AIM Mail account. Please contact them and let them know that they're missing out on all the super features offered by AIM Mail. And by the way, they're also missing out on your email. Thanks. (in reply to RCPT TO command)