Change SPF for all domains

Hello, I am trying to add an include: spf.mydomain.com to all dns zones, how can I do this?

I have tried the following procedures:
I created dns_spf.conf in /usr/local/directadmin/data/templates/custom

I directly edited dns_spf.conf in /usr/local/directadmin/data/templates

I ran the command:
cd /usr/local/directadmin
echo "action = rewrite & value = named" >> /usr/local/directadmin/data/task.queue

I added extra_spf_value = spf.mydomain.com in directadmin.conf and does not rewrite spf on domains already created.

Did you see option 2 in this guide?: https://help.directadmin.com/item.php?id=616

ditto said:

Did you see option 2 in this guide?: https://help.directadmin.com/item.php?id=616

Click to expand...

No, because I'm afraid of him replacing current client DNS zones.

This:

M7Web said:

I am trying to add an include: spf.mydomain.com to all dns zones

Click to expand...

and this:

M7Web said:

I'm afraid of him replacing current client DNS zones.

Click to expand...

contradict with each other.

wattie said:

This:



and this:



contradict with each other.

Click to expand...

I want to include spf, but I don't want to replace spf.

Because it has old configuration that I can not replace, just add.

wattie said:

This:



and this:



contradict with each other.

Click to expand...

I am Brazilian, I use google translator to translate, it is difficult to express.