4,827 questions
Make sure that NetworkCredentials you set are correct and try to follow this links
5-7-57-smtp-client-was-not-authenticated-to-send-anonymous-mail-during-mail-fr
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.57 Client not authenticated to send mail. [ZR0P278CA0017.CHEP278.PROD.OUTLOOK.COM]
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(153.6, 26%, 24%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESG%3C/text%3E%3C/svg%3E)
Sajith Gopalakrishnan Hema
1,056
Reputation points
Getting error while sending email using .net and web.config has the following details-
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.57 Client not authenticated to send mail. [ZR0P278CA0017.CHEP278.PROD.OUTLOOK.COM]
<network host="smtp.office365.com" defaultCredentials="false" enableSsl="true" port="587" userName="" password=""/>
Developer technologies | ASP.NET | ASP.NET Core
{count} votes
-
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(3.2, 24%, 10%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESW%3C/text%3E%3C/svg%3E)
Sam Wu-MSFT 7,561 Reputation points Microsoft External Staff2021-04-26T03:20:00.893+00:00 @Sajith Gopalakrishnan Hema Do you only get this error when you publish on iis? Can it work locally?
-
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(288, 68%, 37%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EHN%3C/text%3E%3C/svg%3E)
Harry Nguyen 6 Reputation points2021-07-09T06:39:33.093+00:00 Im having same issue
-
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(99.2, 96%, 19%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EGP%3C/text%3E%3C/svg%3E)
Geovany Pb 6 Reputation points2021-08-30T14:13:41.83+00:00 Im having same issue. Only publish on iss! Works locally, with the same credentials. Would you help me?
-
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(105.60000000000001, 57.00000000000001%, 20%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EM%3C/text%3E%3C/svg%3E)
monkeymers 1 Reputation point2021-09-04T00:56:26.737+00:00 I just came across this today. My fix was re-enabling TLS 1.0 in Office 365 until my dev team can finish our patch for TLS 1.2.
https://learn.microsoft.com/en-us/lifecycle/announcements/transport-layer-security-1x-disablement
-
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(275.2, 34%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EC%3C/text%3E%3C/svg%3E)
ctilwani 1 Reputation point2022-01-31T11:26:51.307+00:00 Hi @Sajith Gopalakrishnan Hema , Has your issue got resolved? Could you please help me out on this. As I'm facing the same issue.
Sign in to comment
1 answer
Sort by: Most helpful
-
AddWebSolution 171 Reputation points2021-04-27T08:06:02.417+00:00 -
Sajith Gopalakrishnan Hema 1,056 Reputation points
2021-07-10T07:40:36.913+00:00 Our Infra team created hybrid connection manager to local exchange from Azure.
Sign in to comment -