|As bind (named) has a line length limit, the dns system does allow for multi-line records.|
We make use of this feature because with long DKIM keys, they wouldn't fit on one line, as they'd be too long.
This is the change to DA where we enabled multi-line records:
For example, the DKIM TXT record we use for directadmin.com looks like this in the db file:
x._domainkey 14400 IN TXT ( "v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEApxJI+ldB/P7ocCsU4MjgC0iK+sIQ2g1Ft1RG3LuqquzaY8dmK+SsLVQi8uuo8t7DzAhsAGcHgHNOi189twbtQEz"
[root@jbmc-software public_html]# dig TXT x._domainkey.directadmin.com +short
If a program is doing a check on this type of record value, it's up to that program to assemble the string into one long value.
For example, exim uses this string, and does know how to assemble the value.
Some other URLs describing multi-line TXT records:
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