I've noticed that some domains have a TXT record with the form
ms=msXXXXXXXX, where each
X is decimal digit.
What is this kind of TXT record used for?
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They are usually used by automated validation procedures whose purpose is to detect wheter you are the rightful owner of a domain; they will ask you to create a TXT record with a specific text string in the domain DNS zone, and then check if the requested record is actually there; if you were able to create it, it's safe to assume you own (or at least manage) that domain.
A record in the form
ms=msXXXXXXXX is typical of the procedure used for domain validation by Microsoft Office 365.