RFC 4408 3.1.3 says
....
IN TXT "v=spf1 .... first" "second string..."
MUST be treated as equivalent to
IN TXT "v=spf1 .... firstsecond string..."
SPF or TXT records containing multiple strings are useful in
constructing records that would exceed the 255-byte maximum length of
a string within a single TXT or SPF RR record.
so if you are getting error “TXTRDATATooLong” a solution for you will be splitting it into multiple strings within the same record set. For example, instead of:
"v=DKIM1; k=rsa; g=*; s=email; h=sha1; t=s; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDx2zIlneFcE2skbzXjq5GudbHNntCGNN9A2RZGC/trRpTXzT/+oymxCytrEsmrwtvKdbTnkkWOxSEUcwU2cffGeaMxgZpONCu+qf5prxZCTMZcHm9p2CwCgFx3
reSF+ZmoaOvvgVL5TKTzYZK7jRktQxPdTvk3/yj71NQqBGatLQIDAQAB;" you can pick a split point where each part is less than 255 characters long and put [double quote][space][double quote]
for example I tried:
"v=DKIM1; k=rsa; g=*; s=email; h=sha1; t=s; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDx2zIlneFcE2skbzXjq5GudbHNntCGNN9A2RZGC/trRpTXzT/+oymxCytrEsmrwtvKdbTnkkWOxSEUcwU2cffGeaMxgZpONCu+qf5prxZCT" "MZcHm9p2CwCgFx3reSF+ZmoaOvvgVL5TKTzYZK7jRktQxPdTvk3/yj71NQqBGatLQIDAQAB;"and as a result I’ve got:
dig -t TXT long.xxxxxx.yyyy @ns-iiii.awsdns-jj.org.
;; ANSWER SECTION:
long.xxxxxxx.yyyy. 300 IN TXT "v=DKIM1\; k=rsa\; g=*\; s=email\; h=sha1\; t=s\; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDx2zIlneFcE2skbzXjq5GudbHNntCGNN9A2RZGC/trRpTXzT/+oymxCytrEsmrwtvKdbTnkkWOxSEUcwU2cffGeaMxgZpONCu+qf5prxZCT" "MZcHm9p2CwCgFx3reSF+ZmoaOvvgVL5TKTzYZK7jRktQxPdTvk3/yj71NQqBGatLQIDAQAB\;"Note that returned TXT contains [double quote][space][double quote] , however the RFC above mandates that string to be treated as the same as concatenated one.
Note that your example does the same too on 128 character boundary
dig s2048._domainkey.yahoo.com TXT /workspace/stepany-HaasControlAPI-development
;; Truncated, retrying in TCP mode.
; <<>> DiG 9.4.2 <<>> s2048._domainkey.yahoo.com TXT
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 61356
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 5, ADDITIONAL: 5
;; QUESTION SECTION:
;s2048._domainkey.yahoo.com. IN TXT
;; ANSWER SECTION:
s2048._domainkey.yahoo.com. 61881 IN TXT "k=rsa\; t=y\; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAuoWufgbWw58MczUGbMv176RaxdZGOMkQmn8OOJ/HGoQ6dalSMWiLaj8IMcHC1cubJx2gz" "iAPQHVPtFYayyLA4ayJUSNk10/uqfByiU8qiPCE4JSFrpxflhMIKV4bt+g1uHw7wLzguCf4YAoR6XxUKRsAoHuoF7M+v6bMZ/X1G+viWHkBl4UfgJQ6O8F1ckKKoZ5K" "qUkJH5pDaqbgs+F3PpyiAUQfB6EEzOA1KMPRWJGpzgPtKoukDcQuKUw9GAul7kSIyEcizqrbaUKNLGAmz0elkqRnzIsVpz6jdT1/YV5Ri6YUOQ5sN5bqNzZ8TxoQlkb" "VRy6eKOjUnoSSTmSAhwIDAQAB\; n=A 2048 bit key\;"