>The only way I could correct this was to manually edit prefs.js.
>There was a line
>which I assumed must be causing the problem. I changed the 1 to 0 and
>could then send e-mail.
You could have done this with selecting the last entry in the left pane
of the 'Mail & Newsgroups Account Settings' named 'Outgoing Server (SMTP)'.
Then select your SMTP server and press 'Edit'.
>Is this a known bug? Is it a change between Seamonkey 1.1.18 and 2.0?
It was very similar in SM1. ;)
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