@mattiassal - What TXT entries are you currently using? Are you using third-party to send mail, or is the droplet set up as a mail server?
You may want to take a look at the following as well:
That'll help guide you through the process and allowing you to quickly create a valid SPF.
Im using the droplet as a mailserver.
ive tried many TXT entries such as
@ IN TXT "v=spf1 a ?all"
but i still get flagged as spam
try @ IN TXT "v=spf1 a -all" see if your mail now bounces
If it doesn't then your problem isn't spf1 it is either the reputation of your host / IPaddress or your spammy content. (that is if your receiver does the "-all" as requested.)
If it does bounce then you are sending mail from the wrong IPaddress (whatever the @ resolves to in your config. section 6.3.5.1 and 6.3.5.2 of the bind9 manual)
