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Dynamics 365 Community / Forums / Microsoft Dynamics CRM (Archived) / Unable to send e-mails...
Microsoft Dynamics CRM (Archived)

Unable to send e-mails to addresses outside of our network.

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Posted on by wink2010 1,110

Up until today this was not a problem.  Suddenly, when users attempt to send e-mails from CRM web app to an e-mail address other than one used by our company (i.e. @yahoo, @gmail, @hotmail) the message fails to send.  CRM shows it as pending and the event log on the CRM server shows the following error:

System.Net.Mail.SmtpFailedRecipientException: Mailbox unavailable. The server response was: 5.7.1 Unable to relay

Again, this was not the situation yesterday.  All e-mails went through then.  It only happens when the recipient is outside of our network.  Any recipient inside our network receives the e-mail.

Any thoughts?  Thank you in advance. 

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I have the same question (0)
  • Suggested answer
    Muhammad Adeel Javaid Profile Picture
    Muhammad Adeel Javaid 5,580 on at

    Check if relaying is enabled on mail server?

  • Suggested answer
    Muhammad Adeel Javaid Profile Picture
    Muhammad Adeel Javaid 5,580 on at

    You can check it through this:

    IIS > Default SMTP Server > Properties > Access > Authentication

    Access Control > Anonymous access - Checked

    Relay restrictions > Relay >

  • wink2010 Profile Picture
    wink2010 1,110 on at

    Thank you for your prompt responses.  We are not using a default SMTP Server through IIS.  We set up the CRM E-mail router to communicate with our corporate exchange server.  From what I have been told, that server is set up for relay.

  • Suggested answer
    Muhammad Adeel Javaid Profile Picture
    Muhammad Adeel Javaid 5,580 on at

    Try this please:

    Open OutlookExpress

    Go to Tools- Email Account- change email- double click ur mail account

    Click MoreSettings- Select Outgoing Server tab

    Check the check box My Outgoing Server SMTP Requires authentication

    Select Logon on using and give your userID and Password

    Click Ok and Next and Finish.

  • Suggested answer
    Muhammad Adeel Javaid Profile Picture
    Muhammad Adeel Javaid 5,580 on at

    Second Suggestion:

    Open the Exchange System Manager;

    Go in Administrative Groups -> Administrative group name -> Server -> Server name -> Protocols -> SMTP;

    Right click on Default SMTP Virtual Server -> properties;

    Access tab -> Relay button;

    Select "only the list bellow" and add your domain and\or IPs you do want to allow the relay

    and finally check  the "Allow all computers witch successfully authenticate to relay, regardless of the list above" checkbox.

  • Suggested answer
    Muhammad Adeel Javaid Profile Picture
    Muhammad Adeel Javaid 5,580 on at

    1-  if all users in the organization are facing such a problem while using (OWA - Outlook POP - IMAP) then most likely its an exchange server settings that needs to be adjusted to either accept relays or for OWA to check the IIS and so on...

    2- if all users, or few in the same organization are facing the same problem only while using Outlook - POP - IMAP  and the OWA is working fine, then most likely it's an outlook settings.

  • Suggested answer
    Muhammad Adeel Javaid Profile Picture
    Muhammad Adeel Javaid 5,580 on at

    You can also refer to this link please for more information:

    social.technet.microsoft.com/.../1a84a06a-f1c8-40b4-ace8-1e264f218aa1

    Regards

  • Suggested answer
    Stef Rose Profile Picture
    Stef Rose 240 on at

    The primary reason I see for a returned error 571 and .NET framework response of outoing_network business_domain_mailing unavailable is that first, there is someone using your mailing_network with non authorized

    protocoles (IP connections, mail servers, non trusted domain accessibility and more...) over your net_domain_authorized. And second, some people over your business_network is using a non proper mailing_domain over Microsoft Technology and I can surely point at @gmail. As an advice, you should never let your employees using public_network_domain when we are talking of business_network administration.

  • Solomon Profile Picture
    Solomon 70 on at

    It appears that the email router server does not have the relay permissions to be able to relay emails through either SMTP or your exchange servers. Are you using Exchange server or any other SMTP servers?

    If you are using exchange 2007/2010, you will need to build the receive connector on the Exchange Hub Transport Server.

    Exchange 2010 - technet.microsoft.com/.../bb125159(v=exchg.141).aspx

    Exchange 2007 - confluence.atlassian.com/.../How+to+Set+Up+SMTP+Relay+in+Exchange+2007

  • AFTAB HUSSAIN Profile Picture
    AFTAB HUSSAIN on at

    Hello,

    Are you still facing this issue.

    Check the links below.

    social.technet.microsoft.com/.../unable-to-relay

    social.technet.microsoft.com/.../issue-with-receiving-emails

    See if these help.

    Thank You !

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