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Feather: a free Monero wallet
https://featherwallet.org/changelog/#Incident%20report:%20Denial-of-Service%20(28%20April%202024)
Feather Monero Wallet
Explains in detail why Feather versions 2.6.5 and below are no longer able to send transactions.
Upgrade Feather to 2.6.6 or above to fix the issue.