do i need MX records for subdomains?

[JohnZing]

Hi

i have a domain domain1.com

to be able to receveive emails sent to 
user at subdomain.domain1.com

what i need to do in DNS is to create 
a subdomain entry for domain1.com
like...
subdomain.domain1.com IN A xxx.xxx.xxx.xxx

Right???

I have MX records for domain1.com
Should i (have to) create also MX records for the subdomains or i dont need it?

Thank you