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What is the maximum permitted number of MIME parts attached to an email?

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I am trying to send a message with lots of MIME attachments from Thunderbird. After I click "Send", I get this error message: "Number of MIME parts exceeds maximum permitted". Unhelpfully it does not say what the maximum is and I cannot find this information in Support.

I have uploaded an image of the message I get. I have 100GB of free disk space on my C drive where my Thunderbird programme is and 531 GB free space on the drive where I keep my Thunderbird profile - with all the mailboxes and archives. Windows 10 desktop computer.

Anyone know what the maximum number of MIME attachments to an email is? Thanks in advance

I am trying to send a message with lots of MIME attachments from Thunderbird. After I click "Send", I get this error message: "Number of MIME parts exceeds maximum permitted". Unhelpfully it does not say what the maximum is and I cannot find this information in Support. I have uploaded an image of the message I get. I have 100GB of free disk space on my C drive where my Thunderbird programme is and 531 GB free space on the drive where I keep my Thunderbird profile - with all the mailboxes and archives. Windows 10 desktop computer. Anyone know what the maximum number of MIME attachments to an email is? Thanks in advance
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Duplicated here https://support.mozilla.org/en-US/questions/1492314#answer-1714985 and still not a Thunderbird issue or something we can help you with.