stranges fonts in reading mails

Hello,

Since a week I get a straings lettertype through my mails by reading only.

I check already the fonts settings and Compose settings for read, but everything is okay.

Tried several other fonts to see if the straings letter should changes too, but that didn't happen

Here is a output ( in the Dutch language, sorry for that ) of a mail, as you can see "Oktober voor het" is in the right fonts.

I hope that somebody can help me to correct this.

Thanks in advance

Best Regards
Cornelis