Dialog and Hamster: What's going on?

Sorry to cross-post this to two newsgroups, but the problem involves two
applications; I'm not certian which one is the problem; and better to
cross-post than start separate threads which will thread differently.  I
also haven't set the Followup-To: header, since I don't know which group
is the appropriate one.

I recently noticed that some of my emails aren't getting to their
intended recipients.  I use Dialog, in conjunction with the proxy-server
Hamster.  After some investigation, it seems that if I compose a message
in my browser's (Opera) email app, it goes to Hamster just fine and then
to its intended recipient.  If, however, I compose it with Dialog's
email composer, it goes to Hamster -- but from there never makes it to
its intended recipient.  I know it gets to Hamster because the N/M thing
ticks up by one email when I send it from Dialog.  But I tried a couple
of times composing more or less the same email in both Opera and Dialog
and sending it to the same address, but only the one from Opera is
actually getting to its intended destination.  (I know it's getting
through because one is an email list to which I subcribe, while the
other is the Photobucket remote uploading email address, which sends an
auto-reply when it gets the message.  I'm getting the auto-replies from
the Opera-sent photos, but not the Dialog-sent.)

Any idea what setting in Dialog could have been changed such that it's
causing this problem?  I suppose it could be a problem with Hamster, but
I don't know how Hamster could properly send some emails and not send
others.

--
Ted S.
fedya at hughes dot net
Now blogging at http://justacineast.blogspot.com