>>> "Eric" == Eric S Fraga <e.fraga@ucl.ac.uk> writes: 
 
   > On Thursday, 23 Nov 2017 at 18:00, Uwe Brauer wrote: [...] 
 
   >> I sent an email which contains say $\int$ I use 
   >> org-mime-htmlize which converts the message to html and 
   >> convert via dvipng the $\int$ to an embedded png. 
 
   > Can you maybe send one such message to this list so we can 
   > see what you are sending and also see if it displays properly 
   > for the rest of us? 

Ok, sure:

Let $\int f dx=0$
and $\sum_{i=1} \alpha_i=1$