email being picked up as spam from hosted domains. main domain is ok

Hi, i have a vps and although i can send mails without problem from my main root account, sending via any of the child accounts created for customers results in their email being picked up as spam (in hotmail at least).

To clarify, mydomain.com is my main name. Email can send without problem,

customersdomain.com, hosted on the same machine, when sending emails they are picked up as spam. The mx dns entries in the zone file are set (by default to) customersdomain.com. and for all the child domains customer1domain.com. etc.

Do i need to ask the datacenter to add a reverse dns entry for mail.mydomain.com?

Is this an issue with the mx records for the hosted domains? Should i change the hosted domaims mx entry on the customers domains to mail.mydomain.com?

I know the ip isnt blacklisted because exactly the same email goes through when sending from the mydomain.com email addresses.

Any ideas?

Many thanks in advance,

Chris

 

 

 

 

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