I have a domain we can call it domain A, that needs to point to sometext.DomainB.com
mail needs to be able to got and from that sometext.DoaminB

when a user enters domainA it should immediately go to sometext.domainb
if a user type wwwdomain a it should goto sometext.domainb

but If I type email.domaina I need it to go to the email server for my hosting provider so I can read my email

I've got it all jacked up
Please help