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If I send email with PDF attachment, it goes to the Inbox without a problem but I send emails from the same server with an html attachment it goes to the spam folder.

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closed as off topic by slhck Aug 2 '12 at 13:57

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That's just how GMail's spam filters are set up. They seem to think that a HTML attachment is a spam indicator. Not much you can do about it. A SPF record, using DKIM and/or a DNSWL entry might tip the balance in your favor. – Dennis Aug 2 '12 at 13:57
Welcome to Super User! We are missing a few details here – do you care about the sending part, i.e. are you a webmaster trying to send a newsletter? Or do you just want the attachment not go into spam from your local user's Gmail account? – slhck Aug 2 '12 at 13:58

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