for outgoing mails:
relayhost = xxx.xxx.xxx.xxx
for incoming mails the PTR ist unimportant.
Ok. So I could use my server to receive incoming mail without the PRT record and for all outgoing relay it to my mates server¿?
@KE, Do I would need to add my mates email server domain name to the SPF record for all my domains I host? Can this be done vis the DNS modifiers in the control panel?