Mail addresses with quotes + Postfix

[Stephan Bosch]

Op 3/1/2018 om 2:07 PM schreef Philipp Berger:
> Dear all,
>
> I have a working setup with Postfix + Dovecot, storing users in a MySQL
> table.
>
> I ran into problems setting up and using a mail address like
> a"@"b at mydomain.tld, which by RFC should be valid, but leads to problems
> in Dovecot. From my debugging, I can see that on the lookup, Dovecot
> replaces %n with "a" (quotes added by me) and %d with "b at mydomain.tld"
> (quotes added by me). So the original quotes are gone, and the
> domain/user split is incorrect.
>
> I am not sure of Postfix passes the address without quotes to Dovecot or
> whether Dovecot can not handle quotes correctly, but I was hoping that
> someone with more insight into Dovecot could help me out here.
>
> System Info: Debian 9, Postifx 3.1.6-0+deb9u1, Dovecot 2.2.27-3+deb9u1
> Postfix master.cf for Dovecot:
> dovecot unix  -       n       n       -       -       pipe
>   flags=DRhu user=virtual:virtual argv=/usr/lib/dovecot/dovecot-lda -f
> ${sender} -d ${user}@${nexthop}
>
> I am grateful for any hints :)
>
> Thank you in advance, kind regards,

Yeah, Dovecot v2.2 is doing some funky stuff with SMTP address parsing.
Dovecot v2.3 should do a better job. I am still not sure if this can be
fixed well for Dovecot v2.2.

Regards,

Stephan.