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Strings in SPF and TXT records should be no longer than 255 characters. However to get around this limitation, per RFC 4408 a TXT or SPF record is allowed to contain multiple strings, which should be concatenated together by the reading application.
-- https://kb.isc.org/docs/aa-00356
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Hi David G,
Thanks for the information and the reference link. I broke up the long string by making several lines each less than 255 chars (separated using the Enter key) -- trusting that the reading application will reassemble it back correctly. The editor saved my record.
I then used Mxtoolbox's DKIM Lookup tool https://mxtoolbox.com/dkim.aspx to query the DNS record. It interpreted the DKIM record correctly.
Thank you! -Ricardo
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