Strange problem with postfix on virtualmin

SYSTEM INFORMATION
OS type and version centos 7
Virtualmin version virtualmin 7.7

i have a strange problem postfix is telling that there is no account that i am putting
email address and password on users on the virtualmin

is telling it fails to connect to mail server (postfix) with this email and password that they are correct, is there some problem with postfix or some setup with virtualmin

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