For a quick simple fix that should be fairly easy to implement, since so many people are having this problem (including myself), why don't you just add an option to use MAPI in the email settings (a simple check box or radio button in the email config options would suffice, thus greying out all the other fields when selected).
Then, you can tell the program to automatically copy the currently selected recipe(s) to the body field of a new blank email of whatever email program the user has set as default (such as Outlook, Outlook Express, Windows Live Mail, IncrediMail, etc). You could even go so far as to have a check box for an option of whether or not to include the nutritional data in the email.
If you really want to advertise your program, you could even include a footer line at the end of the recipe with a simple link to BigOven.com!
For futher revision, you could maybe even include options such as: Insert the recipe into the email as a) Text Only, b) BigOven format, or c) HTML (which would preserve the formatting as set up in the BigOven theme file and include any photographs or other data).