Outlook do not show the email like formated and sent by ERP Next

Dear all,

We are now using the ERPnext system since a while and unfortunately our customers are starting to complain about the format of the emails sent by ERPnext. Our customer uses mainly Microsoft Outlook on Windows to read and send emails.

The emails look always weird. The distance between rows are higher then in ERPNext and pictures are sent huge to the customer. It does never look like the format used in the Emails create and sent over ERPNext.

Does anyone encounter the same issue and is there a solution for it?

ERPNext: v13.39.2 (version-13)
Frappe Framework: v13.41.3 (version-13)

with best regards,
Carlos Ribeiro Simoes