Evironment
more /etc/redhat-release
CentOS Linux release 7.5.1804 (Core)
rpm -qv roundcubemail-core
roundcubemail-core-1.4-69.2.el7.kolab_16.noarch
Error:
When a user is logged into the kolab website via GSSAPI/Kerberos authentication the system is unable to sent any invitation emails while creating/editing/deleting calendar events.
Workaround
--- /usr/share/roundcubemail/program/lib/Roundcube/rcube_smtp.php~ 2018-10-26 09:40:14.000000000 +0200 +++ /usr/share/roundcubemail/program/lib/Roundcube/rcube_smtp.php 2018-11-06 11:26:12.936766432 +0100 @@ -155,7 +155,8 @@ } // attempt to authenticate to the SMTP server - if (($smtp_user && $smtp_pass) || ($smtp_auth_type == 'GSSAPI')) { +// if (($smtp_user && $smtp_pass) || ($smtp_auth_type == 'GSSAPI')) { + if ($smtp_user && $smtp_pass) { // IDNA Support if (strpos($smtp_user, '@')) { $smtp_user = rcube_utils::idn_to_ascii($smtp_user);