I have a question regarding SPF records.
Their is a company who filters all mail to remove spam (has the 1st MX record), and then forwards it to the ISPConfig server for our customer.
Is it possible to setup ISPConfig (SPF record) so that it can only receive mail
from this external company? It only has to be done for that customer only.
For all the other customers we rely on spamassasin
Thanx so far,