At 17:39 +0100 on 04/10/2007, Tony Finch wrote about Re:
rfc2821bis-01 Issue 17: all contination lines must use :
> The OPES team looked long and hard for a way to break out of the timeout
situation and the "150-" situation really was the best solution to get
proposed, and it actually seemed to work with current existing servers.
Sendmail and Exim will treat 1yz-... as an error.
Not relevant since the scenario we are talking about is not the MUA
sending a 150 to the MTA but the MTA sending the 150 to the MUA (so
as to restart the Time-Out clock and keep the session Open/Alive).
The only situation where the fact that Sendmail or Exim do not like
150s is valid is when they are RELAYING a message to another SMTP
Server that needs to do some extended housekeeping before accepting
the message and this is sending interim 150s to say it is working on
the request and the session is to be maintained.