Hi and thank you for the answer,
yes, I understand the point.
The setting was on "off". Also Joomla is setted on "no editor". I made also a new template from the button "Website editor". And, it is right, thistemplate hasn't a HTML Editor.
I made a list with me myself and I made a newsletter. The email it comes shows as a text-only email. But if I take a look in the raw source the HTML Code is there:
<html xmlns=3D"http://www.w3.org/1999/xhtml" xmlns:v=3D"urn:schemas-microso=
ft-com:vml" xmlns:o=3D"urn:schemas-microsoft-com:office:office"><head><!--[=
if gte mso 9]><xml><o:OfficeDocumentSettings><o:AllowPNG/><o:PixelsPerInch>=
96</o:PixelsPerInch></o:OfficeDocumentSettings></xml><![endif]--><meta http=
-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8" />=0A<meta n=
ame=3D"viewport" content=3D"width=3Ddevice-width, initial-scale=3D1.0" />=
=0A<title>Nur für mich</title>=0A<style type=3D"text/css">#acym__wysid=
__template .acymailing_content{margin-bottom:10px}#acym__wysid__template .a=
cymailing_content .content_main_image_caption{text-align:center}#acym__wysi=
d__template .acymailing_content .acydescription img{display:inline-block}#a=
cym__wysid__template .acymailing_content .acymailing_readmore{margin-top:10=
px;display:block}#acym__wysid__template .acymailing_content td.cflabel,#acy=
m__wysid__template .acymailing_content td.cfvalue,#acym_wrapper td.cflabel,=
#acym_wrapper td.cfvalue{padding:.2rem .625rem}.alignleft{float:left;margin=
:.5em 1em .5em 0}.aligncenter{display:block;margin-left:auto;margin-right:a=
uto}.alignright{float:right;margin:.5em 0 .5em 1em}.revealonline{display:no=
ne}#acym__wysid__template .acymailing_content img{height:auto}</style><styl=
e type=3D"text/css"></style><!--[if mso]><style type=3D"text/css">#acym__wy=
sid__template center > table { width: 580px; }</style><![endif]--><!--[if !=
mso]><style type=3D"text/css">#acym__wysid__template center > table { width=
: 100%; }</style><![endif]--></head><body yahoo=3D"fix">Donnerstag, 17. M&a=
uml;rz 2022
...
</body></html>
And... there are no carriage returns...
Did I make a mistake somewhere?
Thank you very much for the help!