Support dynamic smtp host based default _host array

[carmei]

Support dynamic smtp host based default _host array (e.g. %z) variable in configuration option

Based on the default host array as follows:

-> main.inc.php
$rcmail_configdefault_host? = array(

'imap.test1.de' => 'test1',
'imap.test2.de' => 'test2,
'imap.test3.net' => 'test3);

I add an additional line of code to the main.inc as follows

%h - IMAP host
$h = $_SESSIONimap_host?;
%z - IMAP host without first part, e.g. %h=mail.domain.tld, %z=domain.tld
$z = preg_replace('/^[\.]+\./', , $h);

$name = str_replace(array('%n', '%d', '%h', '%z'), array($n, $d, $h, $z), $name);
return $name;

to support user defined smtp settings instead of php mail function.

-> main.inc.php

$rcmail_configsmtp_server? = 'smtp.%z';

Maybe this is an improvement for future releases.

[thomasb]

Duplicate of #1487003