My domain is example.com,i cannot send mail to user@example.com getting a NDR message of user not in the local table.how can i resolve the issue.I am using Postfix MTA and Centos 5.6
is the user specified with a capital letter, postfix will lookup users with lower case letters, where the unerlying system will differentiate between users with capital letters and lower case letters, ususaly giving this error if say you have a login account named "User" and the email is addressed to "user" (notice capital U for system username and lowercase u for mail-address.
Else I can't say anything further before we see any specifics about your configuration of postfix.
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