Undeliverable message reply to invites

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New Member
Outlook version
Outlook 2013 32 bit
Email Account
Exchange Server 2013
I am using Outlook 2013 and when I send meeting invites through my exchange email the invite goes out fine but when some invitees reply to accept, they receive a message that says below-help please. I have had this problem for a while and can't find a solution!

Delivery has failed to these recipients or distribution lists:

The recipient's e-mail address was not found in the recipient's e-mail system. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try resending this message, or provide the following diagnostic text to your system administrator.
Do all responses bounce? Are only meeting invitations affected? It sounds like the reply address is wrong, but it should affect all replies and responses.

Are you sending the invites to coworkers or people outside the company?

Is this an on-premise server? what is the internal domain name? Do the NDRs say what address bounced?
It only occurs with Calendar invites. I don't think it's all meeting invites but many to small and large organizations. Sending to people outside the company. I don't have others in the company. GoDaddy is the host.

I don't know the internal domain name. I've posted additional message detail below. GoDaddy told me it was on the recipient's end that their email was bouncing but that doesn't make sense to me and I need to fix this.

Diagnostic information for administrators:

Generating server: P3PW5EX1HT003.EX1.SECURESERVER.NET

#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##

Original message headers:

Received: from P3PW5EX1MB01.EX1.SECURESERVER.NET ([]) by
P3PW5EX1HT003.EX1.SECURESERVER.NET ([]) with mapi; Sat, 25 Oct
2014 18:43:58 -0700
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: "dan@thetaxdan.com" <dan@thetaxdan.com>
To: Daniel Gaffney
Date: Sat, 25 Oct 2014 18:43:58 -0700
Subject: Accepted: test again
Thread-Topic: test again
Thread-Index: Ac/wvkbhz6ILoEXkR7Cc1WNMgAS1IgAAAaBw
Message-ID: <6F11F4C0511ECA408A8C3E8089FC492B58FC700FF6@P3PW5EX1MB01.EX1.SECURESERVER.NET>
Accept-Language: en-US
Content-Language: en-US
X-MS-TNEF-Correlator: <6F11F4C0511ECA408A8C3E8089FC492B58FC700FF6@P3PW5EX1MB01.EX1.SECURESERVER.NET>
acceptlanguage: en-US
MIME-Version: 1.0
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