Hi Ellie/Thomas (David?)
I'm a member of a number of Yahoo groups and have the same problem. I'm aware of what the RFCs say about this but, as a software developer myself who has had to write software to implement certain RFCs, I'm also aware of Postel's Law (http://en.wikipedia.org/wiki/Robustness_principle). This says that an application authors should:
Be conservative in what you do; be liberal in what you accept from others.
In other words, when you're sending a message in SMTP format you should strictly adhere to the rules that are stated in the RFC (this is where many, many modern email clients and web based apps break the rules) however, when you're receiving a message supposedly in SMTP format, you should accept that the rules may be broken and try to cope with them. It is this latter part where Pegasus falls down and, despite having been a user of Pegasus for 15 years or so (including making a couple of, albeit relatively small, contributions to its development), it is this part that (along with a couple of others) is causing me to seriously assess whether I should change to use a different email client. In fact I have been assessing Thunderbird recently as it now seems to have all the features I generally use in Pegasus, as well as an extension to password protect Profiles (albeit a relatively simple one, but that is adequate for my needs).
The other issue that is causing me grief is the handling of hyperlinks when messages are read as plain text and configured to have long lines reformatted. The reformatting breaks the hyperklinks. Thunderbird doesn't seem to have this problem, and nor does Outlook, but whenever an email message contains hyperlinks longer than the width of my message reader window I have to toggle the "Reformat long lines" option in order for the whole hyperlink to be recognised as a hyperlink. Even then, it doesn't always work; I have received numerous emails where a hyperlink is recognised and highlighted (up until the end of the reformatted line) in Pegasus but, when I toggle the "Reformat long lines" option, the hyperlink is no longer highlighted and clickabe.
Anyway, the second issue is off topic here (I'll search for it elsewhere) but the first issue is a nuisance that could be avoided if Postel's Law was followed in Pegasus.
Thanks for your time.
John