I need a solution
Receiver received the email but SMG transfered failed and gave the details:501 <**.**.**> is invalid or DNS says does not exist when receiver replied this email, so how to resolve this problem? thx.
Receiver received the email but SMG transfered failed and gave the details:501 <**.**.**> is invalid or DNS says does not exist when receiver replied this email, so how to resolve this problem? thx.