The messages you see are totally dependent on remote graphics which deserve caution and which Pegasus Mail protects you from only retrieving them upon request (when you consider the source is safe).  This has become a real pain because so many senders not use services that distribute email in this manner.  If you receive these messages from the same sender you can add

that sender to the remote graphics whitelist so that the graphics will load automatically.  With the message open,

right click inside the reader window, select "Add sender's address

to...", select "Allow remote graphics list".  There is also an option to globally allow remote graphics though I do not recommend this.  It is in Tools > Incoming mail > Message reader.

I have a few sources on my whitelist but for most of these, if the source indicates the message may be of

interest I open it in a browser because I expect to have to

follow links so might as well start out in the browser. 

I am an unsophisticated old man, with only a hazy idea of email protocols.  So be patient with me...  I have used Pegasus for decades, as a POP-3 client.  When my university abandoned their own mail system and subscribed to M-S 360, they discontinued POP-3 support entirely. (They have only IMAP.)  I do not want my mail stored in somebody else's server in the cloud, and moved to a new mail host and continued to use POP-3 protocol.  But increasingly I am getting messages consisting largely, (and sometimes entirely) of graphics.  In order to be able to read these I have to right click on the message, select, "Show Graphics", and frequently, click again, and choose, "Open in Browser".  This is obviously a recognised problem, as some senders include a tiny link at the top of their messages, with something like, "Can't see the graphics? Click here for Web version".

What is going on here?  Is the issue that POP3 is being phased out by senders? Do I need to capitulate and move into the cloud?  Is there something in my Pegasus  configuration that I can change to make the messages display without having to go through multiple steps? (eg. automatically display graphics, without having to right click, choose to display graphics, reassure that I recognise the security risk, and really want to do it, ...)