553 sorry, your envelope sender has been denied (#5.7.1)

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ClearSwift
Microsoft Exchange
Symantec
TrendMicro
hi, i have a user that receives a delivery failure report when he sends an email to a particular email address. the delivery reports gives this messaage "553 sorry, your envelope sender has been denied (#5.7.1)" as the cause of the delivery failure. i sent a test email to that email address and i actually get the same results. any ideas why this happened?? your inputs are greatly appreciated!..

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5.7.1 = Delivery not authorized, message refused
Looks like blacklisting or reverse DNS checking.
I would look into your SMTP relay log to see at which step it is refused.
Reasons I can think of are :
The user adress is blacklisted
your domain is blacklisted
you don’t give the FQDN during the EHLO command.
you don’t have a reverse DNS entries on your MX record.

on the other hand : the first code 553 is normally “too many recipients”.
So that could be they customized the response code and that they are meaningless …

i have had experiencing this problem, but it has been solve by enabling the FQDN on my E-mail server.(i am using M-Daemon e-mail server ver 9.6.4).
the option command is located at Miscellaneous Options, put tick / enabled on this command below:
Use FQDN Value in “by” section in all “Received” Header stamps.
once it’s enabled , it works fine. my mails have been delivered without any problem.
if you’re just an e-mail client user, please get your network administrator to do it.

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