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error message when sending email in outlook

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Posted on by zoe

HI~

when I sent email but I have error message

thanks all replies

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Andy Sather on at

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Hello - Do you know if this is for On Prem or Saas? If this is Saas, are you using On Prem Exchange or Exchange Online? Currently in Saas, email is only supported via an Online Exchange license.

learn.microsoft.com/.../admin-how-setup-email

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zoe 15 on at

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Hello Andy,

This is for Saas , but i don't know is using On Prem Exchange or Exchange Online , sorry

This is the url I refer to, Ths

businesscentralgeek.com/5-ways-to-send-an-email-in-business-central

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YUN ZHU 95,329 Super User 2025 Season 2 on at

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Hi, have you tried the standard function of sending emails? Can it be sent normally?

For example,

Details can be found in the Email Outbox if there are errors.

If there's a problem with standard functionality, it's a mailbox setup problem.
If there is no problem with standard functions, please check your code part.

Hope this helps.

Thanks.

ZHU

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Govinda Kumar 2,304 Moderator on at

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Hi zoe,

If you are sending emails through code, it would be helpful if you could share your code as well with the error message. Additionally, please check the email outbox to see if there are any errors there as well.

Regards

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zoe 15 on at

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Hi ZHU,

I try to standard function of sending emails but it is not work and error message is same .

I think it's a mailbox setup problem.

What should I do for mailbox setup.

Thank for your reply.

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YUN ZHU 95,329 Super User 2025 Season 2 on at

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Hi, hope the following helps.

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

https://learn.microsoft.com/en-us/training/modules/set-up-email/

Thanks.

ZHU

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zoe 15 on at

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Hi People Eater,

I think code is not error.

and email outbox error message is

"Failed to send email. Error: The property 'subject' does not exist on type 'Microsoft.OutlookServices.Message'. Make sure to only use property names that are defined by the type or mark the type as open type. REST APIs for this mailbox are currently in preview. You can find more information about the preview REST APIs at ">https://dev.outlook.com/."

Thank your reply.

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Govinda Kumar 2,304 Moderator on at

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Hi zoe,

If you think it's not the code error and you're receiving the same error for standard email functions, then please double-check your email setup settings. Here are the basic SMTP setting steps:

After setting up the SMTP, make sure to set it as default and send a test email to see if you still encounter the same error.

Regards

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zoe 15 on at

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Hi People Eater,

I set up the SMTP and send a test email and error message is not same.

Error message is

''The email was not sent because of the following error: "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."

Depending on the error, you might need to contact your administrator.

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Inge M. Bruvik 1,105 Moderator on at

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You should probably contact your IT people and have them check that you use the correct SMTP setup and authentication.

Or if you have any customization around this in your system you should contact your developer so they can debug this together with you.

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