One of our IP Messenger users could not receive messages but can send.
Other users could not send messages to him and prompt a notification to retry sending but could not still be sent.
Then suddenly, the said recipient disappears from the list of users.
All posted solutions from your website had already done. But it doesn't fix the problem.
There's 2(two) IP user out of 40 users encounter the said problem.
Thank you.
(Doomo arigatoo gozaimasu)