How do I recover lost email accounts and data from Mail app on Macbook Air M2?

“How do I recover lost email accounts and data from Mail app on Macbook Air M2: […]I've managed to recover my desktop and files, but my email is completely blank - no accounts or emails.[…]Any hope for recovery? Macboo Air M2 Tahoe 26.6.2”

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Mail Gone Missing and Suspicious Activity:

A.Extract Mailboxes:

Have any computers with this eMail account on it? If so, power off your modem and router to avoid syncing with Apple’s servers. Then, extract your Mailboxes from that.

1. Co Here: Import or Export Mailboxes in Mail on Mac - Apple Support
2. Scroll to: Export mailboxes
3. Proceed from there as necessary.

Modify your Credentials:

Secure your Info:

A. Verify your Devices:

Verify that all devices are logged in to your account, by using this link: Check your Apple ID Device List to See where you're Signed in - Apple Support

then...

B. Modify your Credentials:

Having received this, someone may have your credentials. So, by all means, consider modifying them. If this were me, I’d do the same for ALL accounts.

• Modify: your login credentials (Using Both a New eMail and a New Password for each and all sites)
• Associate: a different method of payment to your account
• Enable: Two-Factor Authentication for Apple ID and for all other accounts that have such an applicable option

Thanks for your response. No suspicious activity and no other computers with this account. Already have 2FA for all my accounts.

Was able to set up my gmail account again and recover some of my emails (3000+ suddenly appeared in a random folder - but most were things I didn’t need). Will just have to refer back to Gmail for anything else.