Messages from contact form not delivered

SupportCategory: TA PlutonMessages from contact form not delivered
Volker asked 3 years ago

Hi Support,
i have a problem with the contact form of the TA Pluton theme: the frontend tells me the message was sent successfully, but i receive an error from our mailserver:

#5.0.0 smtp; 530 Authentication required

is there any way i can set the required authentication data for the mailserver?
Regards, Volker