A coworker received a Bounced Email notification when trying to send a message from her personal Gmail to our GoDaddy-based support email: the error message included "This message has been rejected due to content judged to be spam by the internet community IB212".
I noticed that the hyperlinks in her email signature--two links to our websites--included something that looks like a tracking link. Example link: http://t.sigopn03.com/e1t/c/5/f18dQhb0S7lC8dDMPbW2n0x6l2B9nMJW7t5XYg4XrjvYVdDNqq5wLKJ8W8rByXx56dLfSf1Fh9j-02?t=http%3A%2F%2F[ website]%2F&si=6113506899787776&pi=d51a010b-8a97-4712-a6bd-40ba154663e3
Our GoDaddy email server was rejecting messages with the signature, but new messages from her came through fine when signature is removed.
She does not to her knowledge use any sort of analytics or click-tracking software, and I'm wondering where this hyperlink addition came from. I am not finding any overt references to this http://t.sigopn03.com site in google results, though it does appear on a handful of email transcripts with sig link.
Anybody know anything about t.sigopn03 or its affiliation? Something to be concerned about?