smtp server not used for out of office replies

[computel]

we are using roundcube 16.11

we have configured this as smtp server $config['smtp_host'] = 'smtp.ourdomain.com:587';

which works perfect when sending and replying.

in managesieve you can have an out-of-office. that messages is not send via the configured smtp server, but via localhost

the localserver doesnt have a dkim server, the server configured via smtp_host does.

why is roundcube not using the correct smtp server?

[alec]

This is controlled by the managesieve/imap server, not Roundcube.