My company uses office 365 for our email, but we also send email from one of our server's IP addresses. My TXT record is:
v=spf1 ip4:XXX.XX.XX.XXX include:spf.protection.outlook.com -all
(XXX.XX.XX.XXX is the server IP address that we send mail from)
However, when sending to certain external emails we get a bounce back saying:
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. <srvexch.network.local #5.5.0 smtp;550 SPF check failed. Sender not authorized>
But we don't get it from all external emails - only from some.
I'm new at this, is there something in my txt record that could cause the bounce back?