[bitfolk] SPF help

I'm trying to set up SPF for my carfax.org.uk domain (whence this email comes). I'm getting a bounce from trying to send to gmail: Diagnostic-Code: smtp; 550-5.7.26 This mail is unauthenticated, which poses a security risk to the 550-5.7.26 sender and Gmail users, and has been blocked. The sender must 550-5.7.26 authenticate with at least one of SPF or DKIM. For this message, 550-5.7.26 DKIM checks did not pass and SPF check for [savella.carfax.org.uk] 550-5.7.26 did not pass with ip: [2001:ba8:1f1:f0e6::2]. However, I think I have the right TXT record in the DNS for carfax.org.uk: @ TXT "v=spf1 mx a ip4:85.119.84.138/21 ip6:2001:ba8:1f1:f0e6::/64 a:mail.carfax.org.uk a:savella.carfax.org.uk -all" and the diagnostic message from gmail isn't all that helpful about why it's not matching. Does anyone have any idea what I've missed here? Thanks, Hugo. -- Hugo Mills | One of these days, I'll catch that man without a hugo@... carfax.org.uk | quotation, and he'll look undressed. http://carfax.org.uk/ | PGP: E2AB1DE4 | Leto Atreides, Dune