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SMTP error in D365 Business Central:

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Posted on by MOHAMMAD TAHA IMTIAZ

421

My email was functioning properly until a few days ago. Now, I'm encountering the following error, even though I'm using an app password.

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Dynamics 365 Business Central

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Keinier Caboverde 4 on at

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SMTP error in D365 Business Central:

Probably you need to check something here:

Check your username or password; it must be correct.

Check your mail server is compatible with TLS or STARTTLS

If your mail server is O365, check your Exchange Online security settings; you'll probably need to enable legacy SMTP. (Opt in to the Exchange Online endpoint for legacy TLS clients using SMTP AUTH | Microsoft Learn)

I hope this helps.
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YUN ZHU 77,981 Super User 2025 Season 1 on at

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SMTP error in D365 Business Central:

As mentioned in the links provided by gdrenteria, this seems to be an authentication issue. Please check your account password again, or try another email address.

Thanks.

ZHU
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gdrenteria 14,557 Most Valuable Professional on at

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SMTP error in D365 Business Central:

Hi

I hope this can help you:

SMTP error (dynamics.com)

Dynamics 365 Business Central SaaS/Cloud: Setting up SMTP (Email) with OAuth2.0 authentication | Dynamics 365 Lab (yzhums.com)

Best

GR

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