[horde] set bind address for outbound smtp connections

[A. Schulze]

Jan Schneider:

> This is possible but you need to specify the configuration manually.  
> You can add $conf['mailer']['params']['context'] parameters to  
> horde/config/conf.php below the CONFIG END markger.

Jan,

looks like it should work but doesn't :-/

I added this to ~horde/config/conf.php:

/* CONFIG END. DO NOT CHANGE ANYTHING IN OR BEFORE THIS LINE. */
$conf['mailer']['params']['context']['bindto'] = '[2001:bd8::1]:0';
$conf['mailer']['params']['debug'] = '/tmp/smtp.log';

I also extended the debug-statement before  
/usr/share/php/Horde/Smtp.php, around line 391
             $foo = print_r($this->getParam('context'), true);
             $this->_debug->info(sprintf(
                 'Connection to: smtp://%s:%s from %s',
                 $this->getParam('host'),
                 $this->getParam('port'), $foo
             ));

Finaly I wrote uppercase letters in $conf['mailer']['params']['host']  
= 'mail.eXAMPle.org';
Now I went to /horde/services/problems.php, filled the form and pressed "send"

This is /tmp/smtp.log:
>> Tue, 26 May 2015 16:10:15 +0200
>> Connection to: smtp://mail.eXAMPle.org:587 from Array
(
     [bindto] => [2001:bd8::1]:0
)

S: 220 ...

but the MTA still get a connection from an other IP then [2001:bd8::1]
I verified the IP is local by "ip -6 addr show | grep '$ip'...

PHP Version: 5.6.7

Hints?

Thanks.