Gmail keeps dropping my email as spam and now a DMARC message

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DMARC Error message from Gmail. I have been having issues with my sales people not being able to send to gmail emails. Usually they come back as:
550, "5.7.1", Our system has detected that this message is likely unsolicited mail. To reduce the amount of spam sent to Gmail, this message has been blocked.

I am still having an issue with this and I am now recieving the following:
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

[email protected]
host gmail-smtp-in.l.google.com [209.85.201.26]
SMTP error from remote mail server after end of data:
550-5.7.1 Unauthenticated email from interventionservicesinc.com is not accepted
550-5.7.1 due to domain's DMARC policy. Please contact the administrator of
550-5.7.1 interventionservicesinc.com domain if this was a legitimate mail.
550-5.7.1 Please visit
550-5.7.1 https://support.google.com/mail/answer/2451690 to learn about the
550 5.7.1 DMARC initiative. 83si2829289qkz.208 - gsmtp

My user is using Outlook and we used POP to connect to email from the servers here.
We are not on any Blacklist
Server reutation is good
Most gmail accounts are people that we have emailed many many times in the past (not Spam or Bulk), they are actual emails.
I am at wits end with this and do not know how to fix.

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johnpaulb-imhs1
Hello, Thank you for your question regarding returned emails due to DMARC. Sorry to hear about the the trouble you are experiencing. The DMARC standard is used by many email providers (such as Gmail, Yahoo, AOL, Hotmail, Outlook), setting up DMARC records can increase your chances of email being delivered successfully. If your problems persist, I recommend submitting a returned email to Live Support as an example so they can investigate further. Thank you, John-Paul