Requested action not taken: mailbox unavailable or not local

Hi Friends,

i have setup exchange 2010 on premise and Recently facing issues regarding email bounce from google App with below error.

Error :

"550 Requested action not taken: mailbox unavailable" only form some of the mail server.
and
"Requested action not taken: mailbox unavailable or not local"

to resolve this issue i search a lot on internet but not able to find any propper solution, after investigation i found the solution and working fine without any problem,

Resolution :

configure Gateway firewall for SMTP Traffic or disable Email scan for Mail server.


in my next blog i will describe various smtp errors with cause and resolutions.

thanks,
Gaurang Patel

How to modify Default SMTP Banner in Exchange 2010

The SMTP banner is the SMTP connection response that a remote SMTP messaging server receives after it connects to a Receive connector configured on a computer running Microsoft Exchange Server 2010 that has the Hub Transport server role or the Edge Transport server role installed. You may want to modify the default SMTP banner for Internet-facing SMTP Receive connectors on an Edge Transport server so that the server name and messaging server software aren't disclosed by the SMTP banner.

Looking for other management tasks related to connectors? Check out Managing Connectors.

Use the Shell to modify the default SMTP banner

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You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "Receive connectors" entry in the Transport Permissions topic.

Note:
You can't use the EMC to modify the default SMTP banner. Don't use the Specify the FQDN this connector will provide in response to EHLO or HELO field in the Receive connector properties page in the EMC.

You control the SMTP banner by using the Banner parameter in the Set-ReceiveConnector cmdlet or the New-ReceiveConnector cmdlet. The default value of the Bannerparameter is $null. When the Banner parameter isn't specified on a Receive connector, or the Banner parameter is specified with the value of $null, a remote SMTP messaging server that connects to that Receive connector receives the following response.

220 <Servername> Microsoft ESMTP MAIL service ready at <RegionalDay-Date-24HourTimeFormat> <RegionalTimeZoneOffset>

When you specify a value for the Banner parameter on a Receive connector, a remote SMTP messaging server that connects to that SMTP Receive connector receives the following response.

<220 BannerText>

Note:
The replacement SMTP banner text string must always start with 220. As defined in RFC 2821, the default service ready SMTP response code is 220.

This example modifies the SMTP banner on the existing Receive connector From the Internet so the SMTP banner displays 220 Contoso Corporation.

Set-ReceiveConnector "From the Internet" -Banner "220 Contoso Corporation"

For detailed syntax and parameter information, see Set-ReceiveConnector.

for More Information Please Visit Microsoft Official Website. : 

http://technet.microsoft.com/en-us/library/bb124740.aspx

how to change Default SMTP port 25 to custom port in Exchange 2010

Problem:

How do I change the port on MS Exchange 2010 SMTP Send Connector?

Solution:

By default the SMTP Send Connector is set to use port 25 with a Smart Host. However if you need to change the port from port 25 to port 587 then follow the below instructions.
Launch the Exchange Management Shell (EMS).
Use the following command in the Exchange Management Shell to get the current Connector information.

Get-SendConnector

To change the port to 587 use the following command

Set-SendConnector "Your SMTP Send Connector" -Port 587

Greetings,,
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