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Changes to Exchange Environment - Email Issues

We have been experiencing the following issues, first of all when sending emails to users in a distribution list, we receive an undeliverable message with the message stating that there is a problem with the user's mailbox.  The other issue is that gmail or aol users are receiving email bounceback messages.  What sort of criteria should I be gathering in an effort to ensure that this issue is resolved as swiftly as possible?
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jduran04
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jduran04
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Arjun VyavahareTechnical ConsultantCommented:
To resolve distribution list sending email issue perform following tasks:


1] Open the distribution group properties in Microsoft Exchange 2010's Exchange Management Console -> Recipient Configuration -> Distribution Group

2] Click on Mailflow Settings
3] Select Message Delivery Restrictions and click Properties…
4] Uncheck Require that all senders are authenticated tickbox

This will solve your issue.

For AOL and Hotmail bounce back issue, suggest you to check your internet public ip address which you configure for incoming emails is blacklisted or not on following website

http://mxtoolbox.com/blacklists.aspx

If your IP blacklited on MXToolbox then you need to whitelist your public IP address then only your email issue will solve. Otherwise share us bounce error message to provide you correct solution.

Regards,
Arjun
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suriyaehnopCommented:
For 1st issue - You have identified what wrong with user's mailbox? it is mailbox size over limit which cause NDR, it is mailbox doesn't exist anymore user already left company.

For 2nd issue - Could you explain further? Post NDR is possible.
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Arjun VyavahareTechnical ConsultantCommented:
Hi,

If you can share your email infrastructure then we may help you to give you best practices to be used for smooth email activity.

Regards,
Arjun
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