SMTP Error (550) suspended

[Gede Adi]

hello , good afternoon how to fixed this ? ( SMTP Error (550): Failed to add recipient " admit.com " (Outgoing mail from "myemail.com" has been suspended.). please let me know , thank you .

[JohnDoh]

Roundcube is open source webmail software it is not a service. This error comes from your SMTP server. Please contact your email provider for support.