Keep emails longer

Re: "Keep emails longer" : "My emails are disappearing after a week or so"

For iPadOS 14: NB: If you have updated to a newer iPad OS: for accurate info. :

Please open the linked article below and choose your correct iPadOS at the top.

Scroll to: "Decide how long to keep deleted emails" and follow those steps.

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For iPadOS 14: Decide how long to keep deleted emails

You can set how long deleted emails stay in the Trash mailbox.

1. Go to Settings  > Mail, then tap Accounts.
2. Tap your email account, tap Mail (below Advanced), then tap Advanced.
3. In the Advanced settings, tap Remove, then select a time interval.

Note: Some email services might override your selection;

for example, iCloud doesn’t keep deleted emails longer than 30 days, even if you select Never.

Above is from the article: Delete and recover emails in Mail on iPad - Apple Support