Mailchimp Newsletters Caught in Spam, Internally, by Symantec Email Security

We run a newsletter subscription service from our website. The newsletters emails always get caught in quarantine, by our Symantec Email Security Service. When external email addresses (like my Yahoo email address) receive our newsletter, the sender address is always the same (similar to newsletter@ourdomain.com), but when our internal email users receive the newsletter, the sender email address is randomly generated and does not have our company email domain (like newsletter@random1.domainx.com and newsletter@random3.domainw.com).

We are unable to whitelist any of the sender email addresses for our internal email users. Any suggestions will be appreciated.
bobox00Asked:
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AmitIT ArchitectCommented:
Can you share the mail flow diagram. For internal user, it should not go to your spam filter software.
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bobox00Author Commented:
I don't have the information you requested. We don't manage the mailchimp account. A third party does. Thanks for your response.
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