dns txt spf help to configure it
I have ispconfig3 server
Same machine runs my custom dns and my mail server
I host multiple domains and sub domains on this machine.
Just like to keep out some intruder mail from using my domains/subdomain with spf txt .
What TXT is recommended for hosting server to keep out of trouble?
I'm after to send mail for all domains (virtual or FQ domains that i host on my server/network) but do not allow to send for no one past that.
plese let me have the txt spf code and if i should place them in each domain dns txt record or only in my main mail server/domain dns txt record.
Thank you so much.
Ispconfig3 is nice tool.