My company email address keeps getting blacklisted in Zoho servers, anyone else having this issue?

My company email address keeps getting blacklisted in Zoho servers, anyone else having this issue?

My company email address continues to get blacklisted (marked as SPAM) by Zoho Servers. This has happened about 3-5 times in the last 6 months and the impact is that emails never make it over to Zoho Desk. 

Every time I contact Zoho Support they eventually get back to me (not timely I will add) and say they have added the email to the SPAM list and the issue goes away. 

Why does this keep happening and what can be done to prevent it?

Thanks,
Hunter