I have a modem connection and I use Mail for my email needs.
Whenever I receive a newsletter such as Apple News or other with lots of inline images, I am able to see them (the images) only if I am online (connected to the Internet). When I disconnect, I only see the placers for the images.
What is annoying is that most of this mails have text rendered as images and if you can�t see them they become almost unreadable.
For those who suggest plain text view, you know that it is not the same at all.
Help says that there is a checkbox for downloading this content in Preferences>Viewing. This is outdated, since this was on the previous version of Mail, an it didn't work properly then.
Also, there is an option for this for IMAP (.mac included) accounts in the "Advanced" tab. None is present for POP accounts.
Thanks a lot for your help on this. I am sure there is a way to display content offline.