Our server listed in your blacklist with a bad reputation

I need a solution

Dear sirs

It’s almost a week that I found again every day our server listed in your blacklist with a bad reputation. Each day I request an investigation at http://ipremoval.sms.symantec.com/lookup/ and the problem seems to be resolved till the next day. The reason provided for the assessment is “The host is unauthorized to send email directly to email servers” but this message cannot help me in any way to figure out what the actual problem is.This issue is costing to our company a lot of problems with our customer using Symantec mail security and so rejecting our emails. There is no spam coming out from our mail server, there is no virus on our mail server and no other pc in our network is sending spam nor is infected. Please keep in mind that our mail server is not listed in any worldwide blacklist but your one. The problem looked like to be solved a couple of months ago

Would you please help me to actually work out this problem ?

Thank you in advance

Kind regards

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