[Bug] FTS invalid address parsing

[Timo Sirainen]

On 9 Apr 2017, at 15.42, azurit at pobox.sk wrote:
> 
> Hi,
> 
> i found another bug in FTS while parsing quoted-printable/base64-encoded sender's name inside 'From' header (again, i was figuring out why some of messages cannot be searched).
> 
> 
> Header: From: =?UTF-8?Q?A=2CB?= <test at example.com>
> Data send to Solr by Dovecot: <field name="from">A@, B &lt;test at example.com&gt;</field>
> 
> 
> Header: From: =?UTF-8?Q?A_B=2CC?= <test at example.com>
> Data send to Solr by Dovecot: <field name="from">A@</field>
> 
> 
> Header: From: =?UTF-8?B?QSBCLEMK?= <test at example.com>
> Data send to Solr by Dovecot: <field name="from">A@</field>
> 
> 
> Dovecot 2.2.27.

This is a bit troublesome to fix and it's already been broken for years before anybody noticed.. I think it's going to take a few releases to get this fixed. I think we'd need to fix message-address parser to support EAI-compatible UTF8 headers and that likely fixes this as well.