Hide hostname in email headers from secondary site

Thomas3461

Registered
Aug 23, 2015
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UK
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Website Owner
Hi,

I have a secondary website in my VPS hosting with a different IP. I want to de-associate the secondary website from the main site. However when I send an email from the secondary website, in the email headers I see host.mainsite.com in 3 different places. Can I replace these with secondsite.com?
The reason I'm trying to do this because the sites are unrelated and it creates an unprofessional impression. Imagine you received an email from (these are fictional examples) best-book-reviews.org and in the email header it says host.super-fast-cars.net. It looks unprofessional.

Email header says:
Code:
Received: from nobody by host.mainsite.com with local (Exim 4.85)
X-AntiAbuse: Primary Hostname - host.mainsite.com
X-Get-Message-Sender-Via: host.mainsite.com: uid via acl_c_vhost_owner from authenticated_id: nobody from /only user confirmed/virtual account not confirmed
 
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