Command parameter not implemented. The server response was: Authenticate first (#5.5.0)

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I am working on nopCommerce based on MVC ASP.NET my email was working fine before this last monday, now I noticed that it is not sending any email (registration, order confirmation, password recovery etc). when I checked the logs, I found this error Command parameter not implemented. The server response was: Authenticate first (#5.5.0) Full error

System.Net.Mail.SmtpException: Command parameter not implemented. The server response was: Authenticate first (#5.5.0) at System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, String response) at System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command, MailAddress from, Boolean allowUnicode) at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, Boolean allowUnicode, SmtpFailedRecipientException& exception) at System.Net.Mail.SmtpClient.Send(MailMessage message) at Nop.Services.Messages.EmailSender.SendEmail(EmailAccount emailAccount, String subject, String body, String fromAddress, String fromName, String toAddress, String toName, String replyTo, String replyToName, IEnumerable1 bcc, IEnumerable1 cc, String attachmentFilePath, String attachmentFileName, Int32 attachedDownloadId) at Nop.Services.Messages.QueuedMessagesSendTask.Execute()

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c#asp.netasp.net-mvcnopcommercesmtp-auth
The problem is with your SMTP server. Contact your network admin to resolve it. - M. Wiśnicki
But it was fine 3 days ago - trighati
But the error which you get say its problem with SMTP server. - M. Wiśnicki
Isn't there any possible way to authenticate from my code? - trighati
The problem is pretty self-explanatory: "Authenitcate first". You will need to add authentication into the code where you set credentials for sending email (sometimes in Web.config, sometimes in code - not sure without seeing your code). A quick search engine search will throw up plenty of tutorials on how to use authentication in .NET. It's possible the SMTP admin probably realised they had an open relay and a bot/person/system was probably using this to exploit it and send spam or something, hence why it was changed - just a possibility. Hope this helps :) - Geoff James

1 Answers

2
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The problem is with your SMTP server. Contact your network admin to resolve it.

Isn't there any possible way to authenticate from my code?

Nope you know only that your server response (#5.5.0) when you try send mail. It's mean you not allow to send mail by this server which you use. If it worked, ask admin what is going now with server.

Here is problem like your