dovecot - Sep 2019 - [Bug] Sieve vacation :addresses match only case-sensitive?

On Wed, Sep 4, 2019 at 8:25 AM Philipp Faeustlin via dovecot <
dovecot at dovecot.org>
> Further investigation showed me that it has to be a bug.
>
> I tested with Dovecot 2.2.36.3 (a7d78f5a2), Pigeonhole version 0.4.24
> (5a7e9e62):
>
> In this version the additional addresses in vacation :addresses
> ["test at example.com"] are handled case-insensitive.
>
> In the new version: Dovecot 2.3.7.2 (3c910f64b), Pigeonhole version
> 0.5.7.2 (7372921a) installed via https://repo.dovecot.org/, (same sieve,
> same configuration) these addresses are handled case-sensitive.
>
> The case-sensitive matching of mail addresses, doesn't make any sense
to
> me.
>
> Could someone confirm this behavior?
>
>
Isn?t RFC-compliant behavior to treat the local part as case-sensitive and
the domain-part as case-insensitive?
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> Le 4 sept. 2019 ? 19:37, Roger Klorese via dovecot <dovecot at
dovecot.org> a ?crit :
> 
> 
> 
> On Wed, Sep 4, 2019 at 8:25 AM Philipp Faeustlin via dovecot <dovecot at
dovecot.org <mailto:dovecot at dovecot.org>>
> Further investigation showed me that it has to be a bug.
> 
> I tested with Dovecot 2.2.36.3 (a7d78f5a2), Pigeonhole version 0.4.24 
> (5a7e9e62):
> 
> In this version the additional addresses in vacation :addresses 
> ["test at example.com <mailto:test at example.com>"] are
handled case-insensitive.
> 
> In the new version: Dovecot 2.3.7.2 (3c910f64b), Pigeonhole version 
> 0.5.7.2 (7372921a) installed via https://repo.dovecot.org/
<https://repo.dovecot.org/>, (same sieve,
> same configuration) these addresses are handled case-sensitive.
> 
> The case-sensitive matching of mail addresses, doesn't make any sense
to me.
> 
> Could someone confirm this behavior?
> 
> 
> Isn?t RFC-compliant behavior to treat the local part as case-sensitive and
the domain-part as case-insensitive?
It is not recommended to rely on local-part case, but it is indeed
case-sensitive.

And this is to avoid such issues that postfix supports address
cleanup/canonicalisation before forwarding mails to dovecot.

----------
RFC 5321:

"Local-part     = Dot-string / Quoted-string ; MAY be case-sensitive
[?]
While the above definition for Local-part is relatively permissive, for maximum
interoperability, a host that expects to receive mail SHOULD avoid defining
mailboxes where the Local-part requires (or uses) the Quoted-string form or
where the Local-part is case-sensitive."
 

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>
> It is not recommended to rely on local-part case, but it is indeed
> case-sensitive.
>
> And this is to avoid such issues that postfix supports address
> cleanup/canonicalisation before forwarding mails to dovecot.
>
> ----------
> RFC 5321:
>
> "Local-part     = Dot-string / Quoted-string ; MAY be case-sensitive
> [?]
> While the above definition for Local-part is relatively permissive, for
> maximum interoperability, a host that expects to receive mail SHOULD avoid
> defining mailboxes where the Local-part requires (or uses) the
> Quoted-string form or where the Local-part is case-sensitive."
>
>


And therefore ?receive liberally? policy that wants to assume
case-insensitivity should single-case the address IN THE COMPARISON.
>
>
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