I am facing an issue and need some guidance. I have a large number of emails saved in MBOX format (exported from Thunderbird), but now I need to convert them into EML files so they can be opened individually and imported into other email clients. I tried a couple of free online converters, but they either do not support large MBOX files or corrupt the folder structure. What is the best and most reliable way to convert MBOX to EML format without losing email formatting or attachments?