D.U.I.A. - Dynamic Updates for Internet Addressing

TXT record for DKIM - huge domainkey

If you want your mail server to be DMARC compliant, you need to configure SPF & DKIM. Both use DNS and need a TXT record. If your DKIM domainkey that needs to be publish in DNS is a very long string, the DNS server will throw an error like this one:
dns_rdata_fromtext: /home/liviu/techtorials.ro.db:29: syntax error

For example, you can add this string as a TXT record without any issue:

but you won't be able to add this one, because is too long:

What you need to do is to brake the huge domainkey using quotes, like this:

and then the DNS server will accept it. The broken domainkey should be added as a single string, like this: