We have a couple of domains, and the emails for them are going through MessageLabs into our exchange server. Yesterday we had an email bounced back with the following error:
smtp.asia.secureserver.net #<smtp.asia.secureserver.net #5.7.1 smtp; 550 5.7.1 SPF unauthorized mail is prohibited.> #SMTP#
We checked the domain and it seems to have a SPF record - v=spf1 mx -all
It is this correct, and if not how to fix that issue ?