I think it is the system error.
Even one of the forum staff is also having mailbox issue.
Seem that you are not the only one having this mailbox problems.
There are already some users did encountered this issues.
In the past i did encountered such problem to the point i created another user just to PM.
Another time was that i need to Send immediately and cannot do any Preview which will indicated error & aborted.
Even i do still have issue as some topics i cannot post to.
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