As a list lurker, there’s a minor irritation with posts from Discourse
they all have a couple of images in them (Visit Topic and a gmail-like
avatar, which is usually just an initial letter).
Almost as if it’s trying to impose a traditional forum view on email
My MUAs show who the mail is from if the From address is intact. My MUAs (all of them) are much better at this, so I do not need to see that in the email body. Two of them even show an avatar graphic if they are a contact, falling back to a letter.
Mails from the list with Discourse do not leave the From address intact, so this doesn’t work. RFC 5322 and RFC 6854 define the From header as the address(es) of the author(s), and the Sender header as the address of the person (or entity, I guess) responsible for actual transmission of the message.
Since gmail doesn’t show images by default (and a mailing list doesn’t
like somewhere one should turn off the default), every post is
by a link to display images. This is tolerable when it accompanies the
occasional actual images but seems excessive on every post.
Many MUAs don’t show images by default or have the option for it. I experience the very same.