Mail app keeps throwing Horde_Mime_Exception after PHP & Mail limits adjusted (Nextcloud AIO)

ℹ️ Support
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2

Can you please post the full raw log message. The stack trace is needed. Instructions for doing so can be found in the support template.

  1. Should lowering mail max_message_size skip already-existing large emails automatically, or is manual intervention required?

Neither – there is no such configuration value.

See the Admin Manual section entitled: Groupware->Mail->Troubleshooting->Get account IDs.