Cannot send email to companies using Office 365

I have recently come into a problem with emailing companies that use Exchange Office 365.
We have regular email contact with 2 companies and recently we are getting the following message when sending them email:
From: Microsoft Outlook
Sent: Friday, August 08, 2014 12:35 PM To: Assist Program
Subject: Undeliverable: Consumers Account No. ##########
Delivery has failed to these recipients or groups:
The server has tried to deliver this message, without success, and has stopped trying. Please try sending this message again.
If the problem continues, contact your helpdesk.
Diagnostic information for administrators:
Generating server: ###.###on.local
consumeraffairs@####.###
#550 4.4.7 QUEUE.Expired; message expired ##
Original message headers:
Received: from
###.###on.local ([fe80::2452:938f:6dd9:822b]) by ###.###on.local
Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.1.100.118] Content-Type: multipart/alternative;
boundary="_000_A53763D7745441418094A31C2B75645B02BF4D49ASUMPTIONSBSass_" MIME-Version: 1.
We have:
Windows Small Business Server 2011
Exchange 2010
Netgear Prosafe VPN fvs318
I have talked to there tech teams and they said it never reaches their queue. The only thing that both of them have changed is that they switched to hosted Exchange Office 365. I'm trying to help out my church, so I am in no way knowledgeable
in Exchange. I have the firewall open to outgoing mail and emails we're going through until about a month ago. Since both of them are no longer going through, I'm sure there is a setting on my end that is not allowing them. Can anyone suggest
where to look?
Thanks.

Hi,
To narrow down this issue, please take your time to collect some information:
Does this happen to message sent to an individual, to a domain, or to a network?
Does it happen for messages sent to recipients within your organization, or to recipients at other domains?
What do the SMTP protocol logs show when attempting to send the messages?
Refer to:
http://technet.microsoft.com/en-us/library/bb124531(v=exchg.141).aspx
Try to stop and restart the Exchange Transport service to check this problem.
Thanks.

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bdc wrote:
I can receive emails and access the internet but cannot send emails.
I use Outlook 2010.
I have followed all the advice from both BT and MS and synch incoming and outgoing emails but still no good.
Everything is fine when back home.
Advice please
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