Encoding problem

Hello,

I have Release 9.0.0_ZEXTRAS_20221203.RHEL7_64_20221216110457 RHEL7_64 FOSS edition. 

Many mails are looking like below. I searched for encoding problem, but I did not find anything. Server is UTF8. Do you have an idea, how can I fix it?

in webgui

�!��b<���r�#+�w��N�^�.0��S1��e_��*�>�CUQG~���}�Rr\޳I
#��`T˙��B�:J Ƒ�K�L��Gy��V��3���;��I�dʲjR,����Έ���=��K��M���`�!T��S�[�y���֎)@".a��
����@k'��E�T��yF�0�)��3o��;ܙ/'��=���A\��8�"?�._�S����)�����ˬED4cl���kP�r��ۘ �0�y(�z:�OO���9{���ϓ��z�����ke�'�.����en����d�=������8��šV������Wh��`���#��f�<�(�,�v�;��75a��M�_�ŽO��Z�0���|�=�C�j`�(��s,�v���n���mU�Ե�w=�mIW�H��J���/

in outlook

n _,-#²U1-¬¬¶ž8$yZ½7 À9 4ÄãX åN
éaÖ]EE)CImnÈ/ á^6-¸ Ô
.¯¥ÊM D¦Úòhs C¢ç §/¤BÚ>µ(Æ®ßı;<:Uß5}~ö.í±Ãô XôpïB> øî¡ğ߸9Ï“şŸ¤°‚‹K© yíÆ1ò yÚpõÕÊ” šp µÊøˆƒŠYÒ8æ]Ô½ZÅâ•j )ÌÉ ÷–ä…ñ!â^ f‹Óòá›ß¢«ß³äÈ|u&b[fqª İÿ»Q.îíÈpú”CM
Ó oö‘€q=Ş:f‰b; ½‹Ÿ¬5cSI ! mvá. 4×w E>ή,ğüßO**¹hñS¬ ©¥
y4*3Ê•µ ¼òL›J¡TÚ g P|­,©Ù‡šq whÜ@ G>  =¦Á=‡ Žq³œDYƒ²$jË nµ"Bû
©ž« \€„;Ìry ŠyÔÀ±ãcæ~®ÕË* uŠîaSI” $÷½æ?̞jŒg•ÿžF c|“kY¾ežÁwHŽkH?Ä
F[çë âÒ 8-äG³,ò iöä$¼Aè0ŠQ<€ ÆŠŠC(>hnÔß.&A;‰Oj§öG
øú –*İQ”Öe£õfP,)5:Ù†Ë^rw…Ô¸ ⴎlTšµÚEÔŠırï3s:ašžW¬EŸ> Û¯x.*¬ K¿R“¯) =ߨ

Regards

EÖ