@jhmeyers: "With Opera 8.0 (7561) for Windows, I continue to intermittently
encounter the same problems as I had reported for 7.54,
namely, that occasionally an email message is being composed,
and when "Send" is finally clicked, the "Send" button
"depresses" but no action ever occurs, and the message
does not move to the "Sent" folder.  If depressing
"Send" is attempted again, there is still no change.
If the message is then found in the "Outbox" or "Drafts"
folder, when I attempt to open that message, all I see
is the text "Message not downloaded," and in fact
my entire composed message can not be found anywhere,
even if it was "Saved" at various times during composition.
The only account I have defined in M2 is a News account,
with both my NNTP server and my SMTP server correctly specified
(NNTP for sending to a news server,
SMTP for sending to an SMTP server for email).
Although I am not saving news articles downloaded for reading
 from my NNTP (News) server, any email message which I have
composed myself does not need "downloading" from anywhere,
and it should *never* be lost, whether my SMTP server
accepts it or whether any error is encountered during sending,
but M2 keeps on intermittently completely losing some of my
locally composed outgoing emails, and that is precisely why
I do not use M2 for anything but News and for emailing page URLs
to myself, plus clicking on occasional "mailto:" links in web pages
for unimportant messages which don't matter if M2 loses them.
I can not reproduce this problem on demand, but it still happens
intermittently, and so often that I am certain that the same problem
is still present in 8.0 as it was in 7.x
Another frequent glitch:
I click one mailbox (e.g. "Sent") and then another (e.g. "Drafts);
very often the second click results in displaying a *single*message*
(i.e. the entire text of one message) in the named window tab
(e.g. "Drafts") rather than the *list* of messages for that mailbox;
once this begins to happen, it occurs again with each subsequent click
on any mailbox or newsgroup name, until I close all tabs and
start over again, clicking just one mailbox or newsgroup name.
Finally, Mail -> Compose still always fails to insert my supplied
"Automatically BCC" address from my mail account properties.
My conclusion is that M2 is getting better, some previous problems
(e.g. not emailing to "Bcc" when using a News account
when there was no "To" address) have been corrected,
but the above problems remain as always.
Sorry I can not provide a reproducible example,
but hope that these observations (re a "News" account
used to compose and send email as well) may prove useful.
Thank you for your interest."
    @jhmeyers: "Let me add just a bit more detail:
<quote>
For messages in "Outbox" or Drafts which have not been "lost,"
the *composition* header lines (into which I can type),
plus the set of "Send," "Attach," "Save," etc. buttons,
appear as would be expected when any *outgoing* message is opened,
but for messages which have been "lost," the mailbox shows
a date and time, but when I attempt to open the message,
only lines which look like the headers of a *received* message
(or news article) are displayed, without tool buttons,
as if M2 thinks that these particular locally composed items
were messages I had downloaded from my news server,
rather than messages which in fact I had composed myself.
Thus the underlying reason for the message body saying only
"Message body not downloaded" may be that M2 has mistakenly
assigned this message the status of an incoming message,
rather than an outgoing message, and has,
according to my News server account properties:
"Incoming: Keep local copy of message body [no]"
decided to throw away the entire body of my locally composed
*outgoing* email message, even though I had "Saved" it many times
during composition.
I hope that this detail may provide a further clue
as to how a "News" account is so unreliable in M2
for composing outgoing email messages.
Thanks again for your interest."
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