On 09:42 am, [email protected] wrote:
Hoi all,
I'm writing a twisted/python SMTP server that accepts emails from a MTA
using twisted. All works well, except that when I return a
defer.fail(None) from processEmail to messageHandler.eomReceived (see
below), twisted dumps the trace back of the last exception on stdout.
Is
there a way to avoid this? I would like to handle the exception
gracefully (with an exception handler) and would not like to see any
trace back from it in my logs. I've read that using None as the
parameter to defer.fail does exactly that... what should I use instead?
By the time you return, you need to have handled any exceptions.
If you want to separate exception handling into a separate function, use
addErrback on the Deferred you have created.
The other thing I would like to do better is to have a way to return
smtp code 421 (service temporarily unavailable) rather than 550 (fatal)
in those cases where I would like to indicate a (temporary) failure to
receive the email. I've patched smtp.py (replace 550 -> 421) for this
but would gladly hear about a way to do this without patching a
standard
component on my system.
This is what twisted.python.failure.Failure.trap is for; you can catch
specific exception types in your errbacks.
Please feel free to ask more specifically if this doesn't answer your
question :).
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