This was the response I had received from Hostmonster. 

Hostmonster - 
The emails sent via Mailman use the IP address 127.0.0.1, which is the default 
IP address of the server. Unfortunately, when emails from this address are 
dropped due to mailing list restrictions, it becomes challenging to lift these 
restrictions, thereby preventing us from resolving the Mailman-related issues 
effectively.   
   
Currently when the emails are sent from mailing lists, then those emails will 
be marked as spam, even though the user didn’t send large volume of emails from 
the server.  
 
We have observed similar issues from other customers using MailMan for bulk 
emailing. I am afraid, there is currently no workaround for this issue when 
using MailMan. Given these challenges, I kindly request you to consider an 
alternative solution, such as phpList over Mailman, for bulk email management.
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