Sửa lỗi SMTP Error (451): Failed to add recipient “email@example.com” (Temporary local problem – please

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SMTP Error (451): Failed to add recipient “email@example.com” (Temporary local problem – please try later).

My server Operating System: Centos 7.8

Problem with Exim and this Problem come after update exim on CentOS 7

Solution: simply Downgrade Exim Updated version to compatible version

$ wget https://github.com/KashifHK123/server-fixes/raw/master/vestacp/exim-4.93-3.el7.x86_64.rpm
$ rpm -Uvh --oldpackage exim-4.93-3.el7.x86_64.rpm