I am creating a server with a primary nameserver and mutliple domains. Do i need to make TXT records for all the domain, they all have there own email, but use the mailserver from the primary.
I am currently on a server running CentOS and Plesk. One option i can choose is to use Domain Keys"
If i enable the domain keys, there are 2 TXT fields created, one with a long key, and one with a o=- value.
If I enable this do i still need to have the SPF records, or is this inferior to the SPF records, in terms of SPAM.