SMTP error 451 Temporary local - please try later

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when I try to send a mail from webmail service then I got {SMTP error 451 Temporary local - please try later } this warning! this is the screenshot-> Text . I have used vestacp and there I have config the DNS, MAIL services and all of things. does anyone know where is the problem? Thanks!

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There was a problem in DNS and vestacp panel so i reconfigured the OS in vestacp after that it's working perfectly.