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SmtpCommandException when sending mails

l tonelli
7 months ago

Hello everyone,

we get the error "[MailKit.Net.Smtp.SmtpCommandException] <SMTP relay>".

SMTPAccount and SMTPPassword parameters are disabled as the SMTP server accepts anonymous authentication. Also, the parameter TransportSecurity is set to none because the server has SMTP Start TLS = FALSE.

We tried setting TransportSecurity to auto, and to use SMTPUseDefaultCredentials, but with each configuration we get the same error. 

What do you think is the problem?
Thank you,
Lucrezia

Parents Reply Children
  • 0 7 months ago in reply to Markus Weiss-Ehlers

    Yes, I set it, in fact the string "<SMTP Relay>" that I inserted in the error was just a placholder to the real value of the parameter.

    The parameters are:
    - AcceptSelfSignedCert: ""
    - Account: ""
    - Address: "user.test@domain.com"
    - AllowServerNameMismatchInCert: ""
    - AuthenticationString: long encrypted string
    - BaseObject: "<Patch Display="Test, User (USTE)"><Key> etc. etc. "
    - ConnectionProvider: "VI.DB.ViSqlFactory,VI.DB"
    - ConnectionString: long encrypted string
    - Domain: ""
    - Encrypt: ""
    - EncryptionCertificateScript: ""
    - MailID: "CCC - Employee - End date has changed"
    - Password: long encrypted string
    - SenderAddress: mail of the sender
    - Sign: False
    - SignCertificateThumbprint: ""
    - SmtpPort: 25
    - SmtpServer: name of the SMTP Server
    - TransportSecurity: "None"
    - UseDefaultCredentials: "False"

  • 0 6 months ago in reply to l tonelli

    I would try a connection to that MTA using simple smtp commands , or either an external email client, and try to send mails via that MTA, so you could discard , isolate and locate the origin of the problem: SMTP server (MTA) or OneIdentity.

    Seems to me (as the error message offers no other info) the server is refusing to relay mail depending on the sender/recipient domain or ip address (mta based problem).

  • 0 6 months ago in reply to juancarlos camargo

    Hello,

    at last it was a server issue. Unfortunately I don't know which issue. The customer just gave me another server and that worked.

    Thank you everyone for the help,
    Lucrezia