SMTP error 451 Temporary local - please try later

Question

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-> . 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!

Answer 1

DNS 和vetacp 面板中存在问题，因此我在vetacp 中重新配置了操作系统，之后它运行良好。