This is a know limitation of Pegasus Mail and a genuine problem when you get around 1920x1080 resolution.  The fonts in following fields and screens are hardcoded and can't be adjusted:  To, Subject, Signature & Identity fields, configuration screens, spell check screens and popup notices (like the Lazy HTML warning).  Some folks report benefits from using screen magnifying apps.  Adjusting font sizes in Windows will not help.

I am still struggling with font size in the sending mail fields? I use windows 7....all fonts are so small in the sending mail dialog boxes I cant see them....reading emails and folders are fine...just font sizes in the dialog boxes...I am using latest 4.63 download.

Please copy me at 2000@vineyard.net, as I am not sure I will get notice of your reply?