Hi,
what exactly you think "that was the end of that e-mail"?
There are two possible situations:
1) Virus dialog (with identification of virus) appears. When you select
"Delete", only infected part of e-mail will be deleted.
2) Heuristic dialog - when you choose "Delete", e-mail will be replaced
with avast! text (something like "Suspicious e-mail, blablabla...)
Because you write that Swen was detected, I think that Virus dialog appears. What provider do you use? (Internet mail or Outlook?)
thanks!
pavels