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At my end, what happens is that I do try to deliver the PM but it refuses to leave my outbox. So I delete it--- at which point the recipient presumably receives the quoted notice.
Does anyone know what might be causing this and how to fix it?
I am guessing the recipients have simply disabled receiving PMs from other user accounts, in which case I have to wait for them to figure out that they need to change their user account settings.
But is it possible that I am simply removing the PM before the system has a chance to deliver it? I typically remove PMs immediately after sending them, to (slightly) enhance security. At other forums this hasn't been a problem. And test email to my own account is delivered almost immediately to my own inbox.
Strong encryption is ideally suited for PMs in forums like this, since otherwise PMs have almost no privacy (this forum, like most, offers little security even for login sessions, for example). I have found at other forums that it is quite possible to exchange gpg public keys (specially created for a specific conversation) and encrypted PMs.
EDIT: some may find it amusing that this devilish statement occurs in my post #666