[RCD] installation of Resend(bounce) for roundcube-1.3.0

Spirk, Werner Werner.Spirk at lrz.de
Tue Aug 1 10:51:09 CEST 2017

I installed the feature Resend(bounce)  for roundcube-1.3.0
according as described under

I didn't find the email address for the developer
Aleksander Machniak so I ...

First of all  "bounce" below "forward as attachment" is shown greyed.
So I cannot test this feature.

So I tried to forward a message "HTTP 500-Error" came up.

The  logs/errors shows:
[01-Aug-2017 10:24:32 Europe/Berlin] PHP Fatal error:  Uncaught Error: 
Class 'rcmail_sendmail' not found in 
Stack trace:
#0 /srv/www/roundcube-1.3.0/index.php(303): include_once()
#1 {main}
thrown in /srv/www/roundcube-1.3.0/program/steps/mail/compose.inc on line 65

I don't know why program/include/rcmail_sendmail.php
where class rcmail_sendmail is defined will not be integrated by 
index.php(303): include_once()

Can anyone tell me what's going wrong and what I have to do?

Thanks in advance

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