On-Prem 9.1 - Simple SMTP config not working (anonymous + port 25)

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Posted on by MLarsen

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Testing out Dynamics 365 9.1 On-Premise and configurating a simple SMTP server (no authentication needed / anonymous + port 25) for sending out emails. Done exactly the same as I've done on version 9.0 so I am starting to think there might be something new to version 9.1 that I don't know of? There is nothing wrong with the SMTP server or firewalls, tested SMTP send via Telnet directly from the CRM-server and it works fine.

I activated Tracing in registry on the server to see if I could get any more error messages relating to this, and there is a few weird once:

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>Crm Exception: Message: Credentials must implement ICredentialsByHost for mailbox 00000000-0000-0000-0000-000000000000 in organization 02d92d4b-c0cd-eb11-bcec-005056a85101, ErrorCode: -2147220970
[Process:CrmAsyncService |Organization:02d92d4b-c0cd-eb11-bcec-005056a85101 |Thread: 31 |Category: EmailConnector |User: 00000000-0000-0000-0000-000000000000 |Level: Error |ReqId: 00000000-0000-0000-0000-000000000000 |ActivityId: fcb40a4b-6128-46dd-9eef-136a04f17b04 | EmailConnectorLogger.EmailConnectorTraceFormat ilOffset = 0x0
>MailkitSmtpOutgoingEmailProvider.Authenticate(SmtpClient): Error occurred trying to authenticate. Error Details: Unhandled exception:
Exception type: Microsoft.Crm.CrmException
Message: Credentials must implement ICredentialsByHost for mailbox 00000000-0000-0000-0000-000000000000 in organization 02d92d4b-c0cd-eb11-bcec-005056a85101
> at Microsoft.Crm.Asynchronous.EmailConnector.MailKitSaslMechanismProvider.GetSaslMechanism(AuthenticationProtocol authenticationProtocol, ISet`1 authenticationMechanisms, IMailboxDataProvider mailboxDataProvider, IEmailAccessConfiguration emailAccessConfiguration, ITraceHandler traceHandler, IFCBRetriever fcbRetriever, IFeatureControl featureControl, IOAuthTokenManagerFactory tokenManagerFactory, IOrganizationService organizationService)
> at Microsoft.Crm.Asynchronous.EmailConnector.MailkitSmtpOutgoingEmailProvider.Authenticate(IMailTransport client, IMailboxDataProvider mailboxDataProvider, IEmailAccessConfiguration emailAccessConfiguration, ITraceHandler traceHandler, IOrganizationService organizationService)
>-- End stack trace --

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MLarsen 508 on at

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This is the configuration I am using (screenshots):

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MLarsen 508 on at

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I have tried to use our internal Exchange server with credentials, and that works, but I want to also be able to use a simple SMTP server without authentication and port 25. That has been working on version 9.0 and earlier.

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MLarsen 508 on at

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Anyone? For now we can only use SMTP-server with authentication for version 9.1 it seems.

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Prashnat Verma 287 on at

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Hi Morten,

The configurations looked okay and same is what I've done as well for configuring Email profile and mailbox. However I am also receiving the same error. I believe this needs to be raised with Microsoft to check and resolve.

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Alex-Pinkis on at

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Hi Morten,

We're mentioning that this is not a supported way in our documentation. Probably, this was enforced with 9.1:

https://docs.microsoft.com/en-us/previous-versions/dynamicscrm-2016/administering-dynamics-365/mt622063(v=crm.8)#create-an-email-server-profile

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MLarsen 508 on at

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Then that must be something new, because I have been using Anonymous SMTP authentication for a long time now. Thank you for clearing that up Alex.

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bdeleval 148 on at

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Hello,

Did you find any workaround about this issue? From our side it's not possible to rollback and we have to server which support ssl or other authentication:-(

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MLarsen 508 on at

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The only solution is to use authentication or integrate directly with your exchange-environment. I guess they did this because of security, anonymous authentication against a mail-server is not the best practice when it comes to security.

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bdeleval 148 on at

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Hello. Thanks for our answer. We use the ip trust to securise our flow. I created a Microsoft case to get help but they probably will answer that's writted in the documentation.

we developed a quick interface which get all emails with "pending" status. we get also the attachments and send the emails with c# by calling the smtp server. After sending the email, we update the status to "sent".

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Sabih Khan 140 on at

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H2016_2D00_11_2D00_29-15_5F00_30_5F00_28_2D00_Mail-server-profile.png"_blank" href="/api/data/v9.1/msdyn_richtextfiles(C4F26471-4699-473E-981A-6D3AFC60B823)/msdyn_imageblob/$value?size=full">community.dynamics.com/.../2016_2D00_11_2D00_29-15_5F00_30_5F00_28_2D00_Mail-server-profile.png

the image use the similar setting. Kindly advise for connecting with 9.1 SMTP Relay

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