[Twisted-Python] Implementing server ESMTP extensions in Twisted

[Adi Roiban]

So,

We have patch for review which works towards allowing the current
STMP/ESTMP server implementation to be sublcassed in order to implement
ESMTP extensions.

Here is the ticket
https://twistedmatrix.com/trac/ticket/8128

If you care about SMTP/ESMTP please send your feedback, here or on the
ticket.

I am not an SMTP/ESMTP expert and I need help in reviewing this ticket.

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My main questions regarding ESTMP extensions are :

1. Do we really want to implement them using sublcassing or using
composition/interfaces/components ... or something else?

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2. From https://en.wikipedia.org/wiki/Extended_SMTP#Extensions

Each service extension is defined in an approved format in subsequent RFCs
and registered with the IANA.

Are there ESTMP servers in the wild which provide extensions which are not
defined by RFCs?

Do we want to encourage multiple implementation for the same extensions or
encourage people to collaborate toward a single implementation which is
hosted by Twisted?

--------

Thanks!

-- 
Adi Roiban
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