The server response was 5.7.57 smtp

It’s a normal transfer action. For other information check out our article on what is an SMTP server. 252. The server cannot verify the user, but it will try to deliver the message anyway. The recipient’s email account is valid, but not verifiable. Normally the server relays the message to another one that will be able to check it. 354 The server response was: 5.5.1 Authentication Required. Learn more at . he SMTP server requires a secure connection or the client was not , The server response was: 5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL FROM [SG2PR0302CA0009.apcprd03.prod. outlook. System.Net.Mail.SmtpException: The SMTP server requires a ...

SMTP 服务器要求安全连接或客户端未通过身份验证。 服务器响应为:5.7.57 SMTP; Client was not authenticated to send anonymous mail d Solution 1 SMTP Settings check the 'Use Authentication' and Provide Credentials for the SMTP (Contact your SMTP Provider if you do not know what SMTP Error: System.Net.Mail.SmtpException: Failure sending mail. -- -> System.Net.WebException: Unable to connect to the remote server.

I have to send mail using my web application. Given below code showing error. The error is : The SMTP server requires a secure connection or the client was not authenticated. smtp.EnableSsl = true; smtp.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.NetworkThis is a list of Simple Mail Transfer Protocol (SMTP) response status codes. Status codes are issued by a server in response to a client's request made to the server.

Feb 29, 2016 · The reason I ask is that if the smtp server is set up with no username and password, the mail server might be saying 'you can't send out email without a username and password' which will create the conflict. Further, the reason this is coming up intermittently may be that your mail server might not require authorization to send to certain domains. I have to change the smtp server in an existent application which uses .Net Framework 2.0 and System.Net.Mail to send mails. But I have the next error while try to Send any mail: ERROR: The SMTP server requires a secure connection or the The server response was: 5.7.57 SMTP; Client...

Dec 22, 2020 · The server response was: 5.7.1 Unable to Relay This could be caused by restrictions related to security or access to your email server - for example, see this article - you will most likely have to contact the person or organisation that looks after your email server. Oct 13, 2015 · To be able to verify if the server (Exchange Online) supports also “standard SMTP” session, we will use the command: Mail from: <Recipient name> In the following screenshot, we can see that the Exchange Online server replies with the “answer”: 530 5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL FROM Apr 18, 2018 · The server response was: 5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL FROM [HE1PR0402CA0015.eurprd04.prod.outlook.com] I've got a feeling that the words "anonymous" and "Mail From" are Microsoft's way of telling us that the mail headers are not being populated with a mail from address.