Undeliverable Emails Error 550

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Over half of the emails that I send from outlook 2010 (IMAP) are bounced back to me, the email that I get says your message did not reach some or all of the intended recipients, and a link to webhostinghub/support/email/fighting spam/email bounce/550 (I obviously didn't include the link)
I don't have any "spammy" words (I think), and it's only when I reply to emails that this happens. I removed my signature and set my authentication setting to ssl, and I set "compose" emails to plain text. Spent 2 hours with support and they will "work on it and get back with me" That was two weeks ago, and I don't know what else to do. I need to be able to reply and keep the conversation inline, I mean....do you guys have any suggestions?
Hello, Thank you for your contacting us about an issue with emails being returned with a 550 error message. We are happy to help you troubleshoot your bounced emails but will need some additional information. Can you provide the full failed email message, including the headers? The headers will provide detailed information on the reason for the email to be flagged with a 550 message. (I looked at your ticket and it did not include this information, it also noted that it was closed since you were able to setup DKIM and SPF records with Live Support over the phone). If you have any further questions, feel free to post them below. Thank you, John-Paul