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Yes, if you didn't log in for more than a year while not having a paid membership, your sent mail was likely purged at some point. While we have no specific policy on purging email, from time to time we do prune the mail of inactive accounts that do not have paid memberships.
Remember that as part of the terms of service, accounts that are inactive for 3 months or more without a paid membership may be removed entirely. We do try to avoid that, but do need to be reasonable about the resource usage of unpaid, inactive accounts. We've specifically done it at least 3 times in the past, particularly during email server upgrades, where moving the email of all long-term inactive unpaid accounts from an old email server to a brand new one would be too time intensive. Typically the cut off for author accounts and above is 2 years of consecutive inactivity, but it's possible there were shorter periods closer to 1 year chosen in past updates.
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