E-mail sending problem

[UniQSoft]

When I try to send e-mail I receive error message
 

he message could not be sent. The setting for your outgoing email [SMTP] server might need to be configured. To find the server settings for 'unqsoft@gmx.com', please contact your email service provider.

Subject 'Test heli'
Server Error: 554
Server Response: 554 5.7.1 <unqsoft@gmx.com>: Relay access denied
Server: 'tommy.heliohost.org'
Windows Live Mail Error ID: 0x800CCC79
Protocol: SMTP
Port: 465
Secure(SSL): Yes

Please help.

May be ypu have to set Up SPF, DKIM, and DMARC records

[KazVee]

This support request is being escalated to our root admins.

[Krydos]

Which domain?