I use a different server to send mail to my mailing list. I want to add an SPF record to my domain to show that the IP of the different server is authorized to send mail (as well as the default server).
The server sending email in the example is 220.127.116.11 with the main domain of test.co.uk.
So far I have
v=spf1 mx a ip4:18.104.22.168/32 mx:test.co.uk ?all, would this work for what I want?
EDIT: I would be sending mail using sendmail. The SPF record would be to increase % of mail going to inbox and also so we can enforce -all in the near future on SPF.