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ThunderBird wierd error dialog box

i get the following error box sometimes when i try to send email.

"An error occurred sending mail:  The mail server sent an incorrect greeting:  Thread limit exceeded g_thread_max 293/290 consult Netwin before changing."

any ideas?  thanks!
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8/22/2022 - Mon

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Check if sending automatically adds an email to a thread or conversation.  Thread limit may be exceeded.


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Thanks, war1

i'm gonna check.  it's one of our employees and she has no idea of what circumstances create this error.  if i understand your second post, you are suggesting that continual replies would stack on top of each other and exceed a limit?  that's not the case.  i'm trying to get more circumstances and i'll resubmit some info when i get it.  thanks for the help sofar.
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the conversation thread idea is not what is going on. it turns out it is only when she attaches a large file. so it must have something to do with large attachments.  thanks for yoru input though!