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Here are some common causes of email problems (you may also want to read the Highrise FAQ page on email):
Your dropbox is for tracking communication with others so it's intended to receive CC, BCC, and forwarded emails only. If you send an email directly to your dropbox address and it doesn't contain a CC, BCC, or forwarded email address, Highrise doesn't know whom to assign it to and the email will bounce.
You need to include the "Fwd:" or "FW:" tag in the subject line of forwarded emails. That tag lets Highrise know what to do with the email.
Make sure you're using the right dropbox address. To check, click on "My info".

Then click on the "Email dropbox" link to see your personal dropbox address.

You can not email someone else's dropbox, only your own.
If you are forwarding an email, the body of the forwarded email must include the contact's from address (e.g. "From: Jane Doe <jane.doe@hotmail.com>").

Without this "From:" part of the email, Highrise won't be able to associate the email with the right contact. If your email client doesn't include this automatically, you can always just manually insert "From: Jane Doe <jane.doe@hotmail.com>" at the top of the email. Highrise will take it from there.
Some email clients (like Thunderbird) will give people the option to send forwarded messages as MIME attachments, rather than quoting the message inline. Highrise does not understand these MIME attachments. Your email client needs to be configured to send forwarded messages quoted inline.
If there's a typo in your email address in Highrise, your email will be "swallowed" without notice because our bounce notifications will be going to that wrong address. Double check your own contact information and make sure the right address is listed.
If you send an email from an address that's not listed under you contact information in Highrise, it won't be processed correctly. Since you can enter multiple emails at Highrise, it's a good idea to just go ahead and add any addresses that you may be using in the future.
Highrise can not always decipher HTML emails. Send emails in plain-text format instead.
In forwarded emails, Highrise looks for a "From: someone@example.com" header. If the "From" is missing, malformed, or not in English, it won't work. You'll need to fix it or rename it to English for Highrise to process it correctly.
If you can't find answers here or in the forums, you can always email support and we'll get back to you within a few hours.