I can also confirm the same error, just after a 12.10 upgrade.
I also found that mails below some limit (like 800-1000 plain ASCII chars) send OK, but longer ones fail, even if the mail is still plain ASCII.
Rebuilding Evo ('stable' 3.6.1 from the Gnome download site), did not help either, so I have created the following bugreport for Evolution:
https://bugzilla.gnome.org/show_bug.cgi?id=687179
I can also confirm the same error, just after a 12.10 upgrade.
I also found that mails below some limit (like 800-1000 plain ASCII chars) send OK, but longer ones fail, even if the mail is still plain ASCII.
Rebuilding Evo ('stable' 3.6.1 from the Gnome download site), did not help either, so I have created the following bugreport for Evolution:
https:/ /bugzilla. gnome.org/ show_bug. cgi?id= 687179