What is the meaning of the SMTP error "451 4.7.0 SPF tempfail: DNS timeout"
We are receiving this error on mails mails send to one specific domain.
Mails are not delivered. When I remove the SPF record I don't get an error message and I am currently waiting for a reply from the recipient. I sent the email using telnet so there is no way of tracing the message.
But I can not leave our domain without SPF record. So I need to figure out what is happening.