Okay, logged in with my iPhone. Could not see anything faint either, but I just touched the screen to the right of “Preview” and it sent to @bocaholly . Hope you don’t mind I tried it with you. Tried sending to myself, heaven knows I talk to myself enough, but I could not send to myself. 

Fiddlerman said
So please try using a different theme and see if it's more visible. I could change the default.  

Ok, folks. I just did some theme trying. This is what I found for the light areas apparing, specifically the little arrowed envelope icon for sending private messages. 

The following themes work, and I stated how visible the envelope to send a private message is.

Minimalist

Light-of-the-angels (odd yellow theme) (kind of faint)

easter-eggs (quite visible, but you better like bright colors)

Wintery-blue (faint)

Desert-haze (very clear)

Ice (faint)

berries-n-cream (visible)

fools-gold (very visible, but bold color theme)

Caribbean (very clear, but bold and bright color theme)

Late-summer (very clear)

Gin-and-tonic (faint)

Cool-blue (faint)

Brown-cream (clear and actually not so bad a color theme)

In-the-money (clear and not a bad color theme)

Hope this is of some help. I was able to see it on my iPhone with these. It is extremely difficult for programmeds to create programs where every aspect of it works on every form of defice, software, etc. But these themes seem to work on an iPhone. I made little comments about what I thought of some of the themes. I did not try the pink one. I do not do pink. I would have to wash my eyes. 

Yes, I need to spend my time better. To be fair, I have been overdoing my violin, viola and cello playing and am resting my bowing arm today. Plus, I already made egg salad, designed a business card for a brother-in-law, finished completing two Graffiti Quilt tops (awaiting a response from my daughter as to which granddaughter wil get which one before I can continue), unloaded the dishwasher, did a load of wash. So, not I am just in my comfy chair. And I simply cannot go a day without playing, so before I sat in my comfy chair, I played my violins, for just a little while. All done.