553 relaying with 1and1

553 relaying with 1and1

Hello,

I have changed my MX records setting in 1and1 - however I am unable to send emails and receive

mx.zoho.eu gave this error:
Remote server returned an error -> 553 Relaying disallowed  as an error message.

Additionally, everytime I log into Zoho Mail, I have a notification telling me my MX records are not directed to Zoho.eu when it is.

Please advise.

Thanks!