LMTP and Sieve with <prefix><recipient_delimiter><user>

[Paul Muster]

Hi,

way forward could be like this:

1) Introduce a new config option 'detail_affix' with parameters 'prefix' 
and 'suffix', defaulting to 'suffix' making sure not to break existing 
setups using <user><delimiter><suffix> respectively 
:user<delimiter>:detail format.
If 'detail_affix' is switched to 'prefix' the expected format of local 
parts turns into <prefix><delimiter><user> respectively 
:detail<delimiter>:user.

2) Add documentation to the Wiki https://wiki2.dovecot.org/LMTP:

* detail_affix = suffix

3) Add description to the relevant default config files¹:

   # The separator that is expected between the :user and :detail
   # address parts introduced by the subaddress extension. This may
   # also be a sequence of characters (e.g. '--'). The current
   # implementation looks for the separator from the left of the
   # localpart and uses the first one encountered. The :user part is
   # left of the separator and the :detail part is right. This setting
   # is also used by Dovecot's LMTP service.
   #recipient_delimiter = +
+
+ # Define if :detail is a prefix or a suffix to the :user address part,
+ # e.g. left or right, when using subaddress extension.
+ # Defaults to 'suffix' making sure not to break existing setups using
+ # <user><delimiter><suffix> format.
+ # Switch to 'prefix' if you use the <prefix><delimiter><user> format
+ # described in RfC 5233.
+ #detail_affix = suffix

4) Changelog

    + now we _fully_ support IETF RfC 5233² (Sieve Subaddress Extension),
      see new config parameter 'detail_affix'.


What do you think?

Thanks & greetings,

Paul



¹ On my Debian this is
/etc/dovecot/conf.d/20-lmtp.conf
and
/etc/dovecot/conf.d/90-sieve.conf

² https://tools.ietf.org/html/rfc5233


Am 13.05.2019 um 21:48 schrieb Paul Muster via dovecot:
> Hi there,
> 
> Dovecot's LMTP implementation and Pigeonhole Sieve already do support
> the <user><delimiter><suffix> format. RfC 5233, the Sieve subaddress
> extension, also offers <prefix><delimiter><user>.
> 
> Could Docecot's LMTP and Pigeonhole be extended to that effect?
> 
> Thanks & greetings,
> 
> Paul