Comments by BigMax (Top 4 by date)

I am in the same situation, three years later ... any news ?

InnerException = {"Impossibile leggere dati dalla connessione del trasporto: net_io_connectionclosed."}

Impossible to read data from transport connection

thx Michael, yes its in try-catch

in System.Net.Mail.SmtpReplyReaderFactory.ProcessRead(Byte[] buffer, Int32 offset, Int32 read, Boolean readLine)
in System.Net.Mail.SmtpReplyReaderFactory.ReadLines(SmtpReplyReader caller, Boolean oneLine)
in System.Net.Mail.SmtpReplyReaderFactory.ReadLine(SmtpReplyReader caller)
in System.Net.Mail.SmtpConnection.GetConnection(ServicePoint servicePoint)
in System.Net.Mail.SmtpTransport.GetConnection(ServicePoint servicePoint)
in System.Net.Mail.SmtpClient.GetConnection()
in System.Net.Mail.SmtpClient.Send(MailMessage message)