dovecot - May 2019 - How to get original recipient from Postfix when using LMTP?

Many people prefer to use LMTP for delivery from postfix for better 
efficiency but X-Original-to header support still missing after many 
years. One affect of this is need to set 
sieve_vacation_dont_check_recipient = yes which violate Sieve standard 
and cause auto-replyies sent to messages that should not happen. Or 
abandon LMTP. or abandon postfix??

So while feature request is stalled are there any realistic workarounds?

On Tue, 21 May 2019 18:24:46 +0000
MRob via dovecot <dovecot at dovecot.org> wrote:
> Many people prefer to use LMTP for delivery from postfix for better 
> efficiency but X-Original-to header support still missing after many 
> years. One affect of this is need to set 
> sieve_vacation_dont_check_recipient = yes which violate Sieve
> standard and cause auto-replyies sent to messages that should not
> happen. Or abandon LMTP. or abandon postfix??
> 
> So while feature request is stalled are there any realistic
> workarounds?
add to smtp_recipient_restrictions, before permitting email but after
all checks:

    check_recipient_access pcre:/etc/postfix/recipient_access.pcre

# cat /etc/postfix/recipient_access.pcre 
/(.+)/ prepend X-Original-To: $1

-- 
Tuomo Soini <tis at foobar.fi>
Foobar Linux services
+358 40 5240030
Foobar Oy <https://foobar.fi/>

On 2019-05-22 08:18, Tuomo Soini via dovecot wrote:
> On Tue, 21 May 2019 18:24:46 +0000
> MRob via dovecot <dovecot at dovecot.org> wrote:
> 
>> Many people prefer to use LMTP for delivery from postfix for better
>> efficiency but X-Original-to header support still missing after many
>> years. One affect of this is need to set
>> sieve_vacation_dont_check_recipient = yes which violate Sieve
>> standard and cause auto-replyies sent to messages that should not
>> happen. Or abandon LMTP. or abandon postfix??
>> 
>> So while feature request is stalled are there any realistic
>> workarounds?
> 
> add to smtp_recipient_restrictions, before permitting email but after
> all checks:
> 
>     check_recipient_access pcre:/etc/postfix/recipient_access.pcre
> 
> # cat /etc/postfix/recipient_access.pcre
> /(.+)/ prepend X-Original-To: $1
Warning, do not do this unless you don't mind recipients of 
multi-recipient emails to see a list of everyone who got a copy of the 
email message, including BCC recipients. This isn't a good solution if 
you want to respect user privacy.