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Below is an excerpt from the log:

exchngdel postfix/smtpd[11617]: NOQUEUE: reject: RCPT from unknown[220.77.94.202]: 554 5.7.1 <unknown[220.77.94.202]>: Client host rejected: Access denied; from=<aldobarban@electrotech.ca> to=<a@ltd.com> proto=ESMTP helo=<samsung-45fa307.kornet>
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You're going to need to give us a lot more info, your main.conf would be a good start. –  Dennis Kaarsemaker Jan 28 '13 at 10:04

1 Answer 1

Client host rejected: Access denied is the result of an smtpd_client_restrictions rejection, such as a check_client_access result of REJECT, or a ruleset of permit_mynetworks, reject.

Beyond that, we can't possibly tell you, since you provide no information whatsoever.

Include the output from postconf -n in your question, as well as the complete logs from a single message or connection that is rejected.

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