Indy TIdSMTPRelay and timeout

Question

We use TIdSMTPRelay to relay some messages. Sometimes the receiving email server will hang and just keep the connection open and our relayer never times out. Is there a way of giving it e.g. 5 mins to deliver the message and then give up?

Answer 1

TIdSMTPRelay has ConnectTimeout and ReadTimeout properties. Indy does not have a SendTimeout property, so if the hang is occurring during a send rather than a connect/read, the only option would be to manually assign an SO_SNDTIMEO timeout on the underlying socket itself, such as by using the Socket.Binding.SetSocketOption() method in the OnConnect event.