Unfortunately I cannot log into your installation. I received this really weird email from your osTicket today:
I'm at a bit of a standstill with this one, guys, but I'm still keen to figure it out.
@fachmarkt have you had a chance to figure out why your system is sending emails in the wrong format?
Hi Stevland,
no, until now not. But i will send you an email with User Login + PW later.
So you can login at our system.
Thank you in advance
OK, tx
keep me posted and let know if you need more input from me
@fachmarkt. I was able to successfully access your osTicket Awesome installation and track down the source of the issue. Thank you.
You are using the attachment_preview plugin. When the plugin is disabled, the issue is not present.
I have opened a GitHub issue with the plugin developer in the hope that he'll have an idea as to what the conflict may be.
@Aliplast, I am assuming that you are using the same plugin, yes?
@fachmarkt I left the plugin disabled in your installation. If you wish to re-enable it you can do so by going to Admin Panel > Manage > Plugins.