Pending setup validating mx record how long
If you select Off, we generate 1 MX record and 2 TXT records.
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When Automated Security is On, Send Grid generates 3 different CNAME records.
In a later step of setting up domain authentication, you give these records to your DNS provider, and then you verify that they upload correctly.
If you don't select these, Send Grid automatically selects them for you.
Make sure the characters you select are different from what Send Grid assigned you initially.