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thunderbird is not removing emails from ISP server

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Thunderbird is leaving my emails on my Optus ISP server, they are being marked as read and left there.

Thunderbird is leaving my emails on my Optus ISP server, they are being marked as read and left there.

Réiteach roghnaithe

And the setting in Thunderbird to leave copies on the server is not set?

Tools|Account Settings|<select account>|Server Settings

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Pop or IMAP mail account

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It is a Pop client

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Réiteach Roghnaithe

And the setting in Thunderbird to leave copies on the server is not set?

Tools|Account Settings|<select account>|Server Settings

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This fixed the problem thanks