Webmail not working

[vvenet]

Hello dear Heliohost team, dear @Krydos and @wolstech, 

I read on Helionet.org that there were problems with the webmail and email of the Tommyy server.
As far as I know, I am on the Johnny server. I also eperience e-mail problems.

Problem 1:
For all my active domains in my account, I have activated webmail.
Nevertheless, I can not login to the webmail area. When I enter the e-mail address and password,  I get this message: "Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator at root@localhost to inform them of the time this error occurred, and the actions you performed just before this error.
More information about this error may be available in the server error log."
And sometimes I also get this message on my screen: "502 Bad Gateway", which won't let me enter the e-mails address and password at all.
Question: how to login into webmail?

Problem 2:
I login into Plesk. There I found out that on one of my domains in my account, at the "Track Email Delivery" section, I have 4 e-mails delayed. However, when I check these 4 delayed e-mails, it indicates "8 items total" but I can not see the items. So there seems to be a discrepancy between the "4 delayed e-mails", "8 items total" and none of those e-mails are displayed. Please see attached screenshots.
Question: how to get access to the delayed e-mails? Or how to solve this problem? What is going on?

Kindly awaiting your reply.
Thank you! 🙂 

Edited 1 hour ago by vvenet