Nicolás schrieb:
myaddr...@gmail.com: host devels.es[78.138.97.64] said: 550-Verification ... subdomain.devels.es. IN MX 0 mail.devels.es
The response comes from devels.es with 78.138.97.64 but your MX-Records points to mail.devels.es with 85.155.102.33.
Have you changed the records lately? In this case your problem could be caused by outdated cached records.
Regards Patrick
