My emails are being "Greylisted" by our customer's email Virus Protection due to servers.

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Two of my primary customers are having issues receiving my emails, both have told me the reason is that they are "Greylisted" due to our mail server has been marked for spamming.  Below is the diagnostic code link:

Remote-MTA: dns;
Diagnostic-Code: smtp; 450 4.2.0 <>: Sender address rejected: Greylisted, see

How can this be resolved. Can we switch our email to a different email host provider? 
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Posted 3 months ago

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Elyzabeth , Official Rep

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Hello Carlos4707
So if their server has us greylisted, they would need to whitelist us on their end. If you need to, you can switch to another email provider, but we wouldn't be able to migrate any existing emails in your inbox.

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