c# - what is means of this problem when sending email through web-application -

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i have error when sending email through our web application " mailbox unavailable. server response was: requested action not taken: mailbox unavailable or not local"

this detail of error

system.net.mail.smtpfailedrecipientexception caught   message=mailbox unavailable. server response was: requested action not taken: mailbox unavailable or not local   source=system   failedrecipient=<email@email.com>   stacktrace:        @ system.net.mail.smtptransport.sendmail(mailaddress sender, mailaddresscollection recipients, string deliverynotify, smtpfailedrecipientexception& exception)        @ system.net.mail.smtpclient.send(mailmessage message)        @ email.globals.sendmail(string emailid, string subject, string message, string sendermail) in c:location   innerexception:

i assume sender credentials not in order - if recipient's mailbox unavailable, e-mail saying actual sending process should work out (if it's not local recipient).

if had guess, i'd trying send e-mail sender address belonging domain not managed smtp server using send e-mail (e.g. gmail address).


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