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Dynamics 365 Community / Forums / Small and medium business | Business Central, N... / smtp email NAV 2016 fa...
Small and medium business | Business Central, N...
Suggested Answer

smtp email NAV 2016 fails sending intermittently

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Posted on by Don Saito 7
We're facing an odd issue where emails sent from NAV will not send intermittently.  The error is: 
 
/The SMTP mail system returned the following error: /Failure sending email/.  Authentication failed because the remote party has closed the transport stream./
 
The email account is an O365 account.  This issue started happening after switching from on-prem exchange to O365.  
 
 
Any ideas? 
I have the same question (0)
  • Suggested answer
    YUN ZHU Profile Picture
    YUN ZHU 95,485 Super User 2025 Season 2 on at
    Hi, I'm not sure because you also had times where the send was successful, but it looks like an O365 SMTP TLS version issue.
    Hopefully other experts can give you better advice.
     
     
    Hope this can give you some hints.
    Thanks.
    ZHU
  • Don Saito Profile Picture
    Don Saito 7 on at
    Yes, I agree it looks like a TLS version issue, though I'm not sure how to remedy that from the NAV development side. 
     
  • Suggested answer
    YUN ZHU Profile Picture
    YUN ZHU 95,485 Super User 2025 Season 2 on at
  • Don Saito Profile Picture
    Don Saito 7 on at
    Thank you Yun, it appears those settings are only in Business Central, not NAV 2016.  

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