WHM/cPanel Question

[nordie]

this is from a friend of mine

Following situation
- WHM/cPanel server = s1234.myhostingserver.com
- Hosting account user name = '123online'
- Website domain = mywebsite.com

WordPress sends an email with the wp_mail() function using php mail. It is send like this:

- FROM = [email protected]
- SMTP.MAILFROM = [email protected]
- RETURN-PATH = [email protected]
- ENVELOPE-FROM = [email protected]
- X-AUTHUSER = [email protected]

THIS EMAIL ENDS UP IN THE SPAM BECAUSE
- Website sends mail from 's1234.myhostingserver.com' while it should send from 'mywebsite.com'

MAIL-TESTER.COM SAYS
Header_from_different_domains - From and EnvelopeFrom 2nd level mail domains are different
- From [email protected]
- EnvelopeFrom [email protected]

[SPF] s1234.myhostingserver.com does not allow your server 123.456.789.123 to use [email protected]
- You do not have an SPF record, add one of the following to your domain s1234.myhostingserver.com
- I cannot do that because I don't have access to the hosting server settings

We could not find an email server (MX Record) behind your domain name s1234.myhostingserver.com.
- that's correct, the MX record is at mywebsite.com

TO FIX THIS THE HOSTING SERVER SHOULD SEND LIKE THIS
- FROM = [email protected]
- SMTP.MAILFROM = [email protected]
- RETURN-PATH = [email protected]
- ENVELOPE-FROM = [email protected]
- X-AUTHUSER = [email protected]

So I need to know if it is possible in WHM/cPanel to change the sending values
- FROM: [email protected]
- INTO: [email protected]
- 123online needs to be the user name of a hosting account in WHM
- mywebsite.com needs to be the websites domain name in that account

It works like that on another hosting account I have that uses DirectAdmin.
Is this not possible with cPanel? Or is it a misconfiguration?

TIA