Explanation of error
I always had a domain on the server, then I went ahead in postfix manager and there check only "Install DKIM & SPF:" and then clicked on "Rebuild Mail Server". The process got completed and then I "Restarted all mail services."
Then I went to "DKIM & SPF Manager" and there I choose domain and "Add DKIM" and also checked "enable SPF". When the process got completed only DKIM was added into DNS record with TTL "0". May I know why TTL? Then I checked for SPF but no record was added for it.
I manually added SPF and changed TTL for DKIM and used an email to check if they were enabled and the result was failure.
May I know what is wrong with the panel?