If you're sending email from Gmail, are you using a Gmail account, or are you using the Send mail as feature of Gmail in order to attempt to relay out mail for your domain name?
Or are you talking about that when you send email from your Gmail account into your InMotion Hosting account that those messages are labeled as spam? If this is the case, you could try to raise your SpamAssassin score required to mark messages as spam to decrease the likelihood of them being flagged.
You can investigate the IP addresses listed in the email headers to also see if the reputation of any of them could be causing the spam filtering to trigger.
Please let us know if you have any further questions at all.
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