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Editorial Team
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Asked: 2026-05-14T14:40:29+00:00

i have this error when i sending email through our web application Mailbox unavailable.

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i have this error when i sending email through our web application
” Mailbox unavailable. The server response was: Requested action not taken: mailbox unavailable or not local”

this is detail of error

System.Net.Mail.SmtpFailedRecipientException was caught
  Message=Mailbox unavailable. The server response was: Requested action not taken: mailbox unavailable or not local
  Source=System
  FailedRecipient=<email@email.com>
  StackTrace:
       at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception)
       at System.Net.Mail.SmtpClient.Send(MailMessage message)
       at email.Globals.SendMail(String EmailID, String subject, String message, String senderMail) in C:location
  InnerException:
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1 Answer

  1. Editorial Team

    I would assume that your sender credentials are not in order – if the recipient’s mailbox is unavailable, you will get an E-Mail saying so but the actual sending process should work out (if it’s not a local recipient).

    If I had to guess, I’d say you are trying to send an E-Mail with a sender address belonging to a domain that is not managed by the SMTP server you are using to send the E-Mail (e.g. a GMail address).

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