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I'm using MailChimp, and I sent out a test newsletter to myself, and the title had ADV: added to the beginning of my title. I'm not sure if MailChimp did that on its own, or if it was outlook exchange. But I have seen other emails that have ADV: at the start of the title

What does it mean? and is there a way to stop MailChimp from adding it?

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Did you check if ADV was added to all emails by checking other email inboxes at Gmail and such? Have you tried running it on a different server? –  John Conde Aug 7 '13 at 20:31
    
ADVertisement which means it will end up in GMail's Promotional tab, Outlook's Junk folder. –  Fiasco Labs Nov 6 '13 at 0:13

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Some states require it (Colorado), but it doesn't look like it's coming from mailchimp based on a Google search. If you're using a filtering service on your inbound messages like an antivirus/antispam firewall or an antispam gateway then they may be prepending the header when something matches their filters. It could be Bayesian or a rule specifically for all e-mails from mailchimp. Some antispam filters will actually look for unsubscribe lines in the messages (although these aren't always technically spam).

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