It depends on how spam filters are configured, but yes, subdomains can harm root domain's reputations. However, it's generally seen as OK to use subdomains to m

It depends on how spam filters are configured, but yes, subdomains can harm root domain's reputations. However, it's generally seen as OK to use subdomains to mitigate reputations being spread to the main domain. As long as you have your records in order to show what's going on, using a subdomain is usually OK.[1] [1]: http://www.magillreport.com/Spamhaus-Provides-Answers-Part-Four/ http://www.magillreport.com/Spamhaus-Provides-Answers-Part-F...