Using SMTP service that in another server, HOWTO set current server using whm/cpanel?

Hi guys,

i use a dedicated server, i cant send email to yahoo mail, i didnt send spam and already send bulkmaster to yahoo mail postmaster few times, but still didnt granted, like others people here, i cant move to another hosting company for now, its ok i dont blame the hosting company since they are very cheap, only get this problem with yahoo mail





so the solution, i use SMTP service that in another server, i already ordered one with max 25.000 emails/month. Here are the authenticated SMTP details in another server I got for example :
Server: authsmtp.otherdomain.com
Username: username@authsmtp.otherdomain.com
Password: password



I already try it, i can use it with outlook express, its works sended to yahoo mail

Now can i set it inside the whm/cpanel? so i can use it for the entire email in the server, like the emails via php (ie. forum registration) and others, not only in outlook express via my computer

The SMTP service company only give methode using outlook express, not using whm/cpanel






Nb. And if its can, just need to route the following domains mail through this account, but if its cant its ok for all email just like the above its enough
yahoo.co.uk
yahoo.com
yahoo.cn
yahoo.ca
yahoo.com.au
yahoo.co.in
ymail.com
yahoo.fr
rocketmail.com
btinternet.com