Using any E-Mail within Blesta with unusual TLD doesn't work

[Em1t]

Hello,

I am running Blesta v5.5.3 on my server. I am running this Blesta installation under my domain which ends with .host

Whenever I try E-Mailing a client through the built-in interface, I get an error message that reads "Please enter a valid from address."

I included a screenshot below.

Is there any way to fix this on my own? Thank you for any help.

EDIT: I just tried creating a user with the same email, and it failed aswell. It seems that this issue affects the entire Blesta panel.

EDIT 2: Since this is a system wide issue, and I couldn't find a way to fix this myself, I have opened a similar post in the bugs section of the forum.

EDIT 3: Found out this is caused because the panel makes a DNS lookup first. I did not have MX records set for my domain.