If you add the include clause, it will retroactively add any additional includes. In fact, if you check the spf.protection.outlook.com record, you will see additional includes therein.
Just be mindful of the 10 lookups limit. There are free "SPF validator" tools online, run the proposed new record against them before making the change, just in case.
SPF Recors for Additional domains
Hi
I have some questions around SPF records.
If we have a domain lets call it main-domain.com and main-domain.com has its own SPF record which includes a mailer and also include:spf.protection.outlook.com -all
If we have a second domain second-domain.com and we want that domain to be able to send email as main-domain.com I assume we would add main-domain.com to the SPF record of second-domain.com using include: main-domain.com
Also where does the include:spf.protection.outlook.com -all come in here? All mail is going out via Online so no on prem. Does include:spf.protection.outlook.com also require adding to the spf record of second-domain.com?
2 answers
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Vasil Michev 95,666 Reputation points MVP
2022-05-16T10:09:54.547+00:00 -
PaulB 1 Reputation point
2022-05-16T10:32:55.84+00:00 Hi
Thanks but that has not really answered my query?
So adding a domain into the include of an SPF record allows that domain to 'send as' the domain that hosts the SPF record as per my example above if second-domain is added into the SPF record of main-domain than that allows second-domain to send as main-domain?
Also should spf.protection.outlook.com be added to all domains that send via online exchange?