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Dynamics 365 Community / Forums / Microsoft Dynamics NAV (Archived) / SMTP mail from Nav2013...
Microsoft Dynamics NAV (Archived)

SMTP mail from Nav2013 with Cumulative Update 5 for Exchange Server 2013

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Posted on by Mikael Smith Larsen 150

Hi

I have a customer, that after they have installed “Cumulative Update 5 for Exchange Server 2013” they are not able to send smtp e-mail form Dynamics Nav 2013 anymore. I have made a very simple test code that generates the error: Mailbox unavailable. The server response was: 5.7.1 Unable to relay. My simple code are shown below:
SMTPMail.CreateMessage('Mr. Hardcode','mhc@gmail.com','mhc@gmail.com','Subject Text test','Body Text test',TRUE);
IF NOT SMTPMail.TrySend() THEN
  MESSAGE(SMTPMail.GetLastSendMailErrorText);

Does anyone have any ideas to what has caused the problem.

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  • Suggested answer
    jcastro Profile Picture
    jcastro 2,245 on at

    Have you changed anything in the SMTP setup? I've faced the same "unable to relay" error when I've been trying to send an email using a sender account I didn't have the permissions for. For example, if the domain of your mail server is @example.com and you are trying to send as @differentexample.com. 

    Also, the relay option is a parameter on the mail server. Make sure it is enabled. This post should help some in that regard. http://exchangeserverpro.com/exchange-2013-configure-smtp-relay-connector/

    Good luck :-) 

  • Suggested answer
    Miguel Llorca Gómez Profile Picture
    Miguel Llorca Gómez 7,019 User Group Leader on at

    I'm not sure if this solution apply to 2013, but for Exchange 2010 works fine:

    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 buttom;

    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.

    Good luck!

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