Mail-Enabled Public Folders Not receiving email from external sources?

I just got moved to Office365/Exchange Online and its all working ok right now except 1 thing.

Our mail enabled public folders are receiving emails from internal sources but anything sent to them from say my gmail account don't show up.

Is something like a receive connector missing? I really don't work with exchange much and we had a consultancy do the migration.

We receive accounting reports from external sources that get sent straight to these folders.

Thank you

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Tsz109Asked:
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Vasil Michev (MVP)Commented:
Any particular NDR you are getting?

Check the settings for the PF in question: go to EAC -> Public Folders -> Public Folders -> Mail flow Settings -> Message Delivery Restrictions. Make sure that "Require that all senders are authenticated" is switched off and that the "All Senders" radio button is checked under "Accept messages from".
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Tsz109Author Commented:
BN1AFFO11FD011.mail.protection.outlook.com rejected your message to the following email addresses:
Op Production Reports (ProductionReports@XXXX.onmicrosoft.com)
BN1AFFO11FD011.mail.protection.outlook.com gave this error:
[ProductionReports@XXXXX.onmicrosoft.com]: Recipient address rejected: Access denied
A communication failure occurred during the delivery of this message. Please try resending the message later. For more tips to resolve this issue see DSN code 5.4.1 in Exchange Online. If the problem continues contact your help desk.


This is strange because I got 2 of the 4 folders working.
It was having to go into the permissions through outlook and allow "Anonymous" to contributor level.
I did the same on the other 2 and I still get this error.
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Delphineous SilverwingGood Ol' GeekCommented:
Make sure the "Anonymous" privileges to the folder allow creating new items (contributor).

Use powershell to ensure the public folder is properly mail-enabled and verify the e-mail address.

Using Powershell with Exchange Online
http://technet.microsoft.com/en-us/library/jj984289%28v=exchg.150%29.aspx

Mail-Enable a Public Folder
http://technet.microsoft.com/en-us/library/aa997560(v=exchg.150).aspx
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Siraj MohammadCommented:
Make sure the primary SMTP is not @onmicrosoft.com  but the original username@domainname.com
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