A TXT (Text) Record is a DNS record that allows a domain administrator to enter arbitrary text into the Domain Name System. Originally intended for human notes, they are now used by machines to verify that you own a domain or to check if an email is legitimate.
google-site-verification=...) to add as a TXT record to prove you control the domain.Yes. Unlike A records or CNAMEs, it is perfectly normal and common to have 5–10 different TXT records for a single domain (one for Google, one for SPF, one for a CDN, etc.).
TXT records are subject to DNS propagation. Also, ensure you haven't added quotation marks manually if your DNS provider adds them automatically—this "double-quoting" is a common reason for verification failure.
No. This is a critical error. A domain should only have one SPF record. If you use multiple services (like Gmail and SendGrid), you must merge them into a single record: v=spf1 include:_spf.google.com include:sendgrid.net -all.
A single string in a TXT record is limited to 255 characters. However, you can chain multiple strings together in a single record to accommodate longer data, such as 2048-bit DKIM keys.
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