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Small and medium business | Business Central, N...

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Email Setup on Business Central On Premise

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Posted on by Haris Korac

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Hello to everyone.
Can you help me to setup email on business central on premise.
I tried several settings but without success.
Some of errors that i got is :
The SMTP server rejected the authentication request, as the authentication data is incorrect. Verify that your Username and Password are correct and that the SMTP server supports the specified authentication type (Basic). SMTP error code: 535.

and this:
Could not connect to the SMTP server.

An error occurred while attempting to establish an SSL or TLS connection.

This usually means that the SSL certificate presented by the server is not trusted by the system for one or more of
the following reasons:

1. The server is using a self-signed certificate which cannot be verified.
2. The local system is missing a Root or Intermediate certificate needed to verify the server's certificate.
3. A Certificate Authority CRL server for one or more of the certificates in the chain is temporarily unavailable.
4. The certificate presented by the server is expired or invalid.
5. The set of SSL/TLS protocols supported by the client and server do not match.

See https://github.com/jstedfast/MailKit/blob/master/FAQ.md#SslHandshakeException for possible solutions.

I tried also OAuth but also without success.

I used my mail that I used for company purpose . That is microsoft mail, have 2 Factor authentication . I tried also with disabled authentication.

Any guides?
Thank you

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Dynamics 365 Business Central

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Khushbu Rajvi. 19,160 Super User 2025 Season 2 on at

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Email Setup on Business Central On Premise

Hope this helps : https://learn.microsoft.com/en-us/dynamics365/business-central/admin-how-setup-email

https://www.kauffmann.nl/2022/09/29/sending-email-via-smtp-in-business-central-online-and-on-premise/

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Jainam M. Kothari 12,132 Super User 2025 Season 2 on at

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Email Setup on Business Central On Premise

May this can help : https://ivansingleton.dev/how-to-install-and-configure-the-email-module-in-business-central-on-premises/

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Sohail Ahmed 11,089 Super User 2025 Season 2 on at

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Email Setup on Business Central On Premise

Adding more details https://www.youtube.com/watch?v=NNdZsd9oAJw

Mark below checkbox to make this answer Verified if it helps you.

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YUN ZHU 92,831 Super User 2025 Season 2 on at

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Email Setup on Business Central On Premise

SMPT should be the easiest, and it has been available since the NAV era. In addition, what email address have you set up? Try your personal Gmail.

PS: Deprecation of Basic authentication in Exchange Online

https://learn.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/deprecation-of-basic-authentication-exchange-online?wt.mc_id=DX-MVP-5004336

https://techcommunity.microsoft.com/blog/outlook/keeping-our-outlook-personal-email-users-safe-reinforcing-our-commitment-to-secu/4164184

Thanks

ZHU

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