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I cannot receive or send emails through Thunderbird.
Hi @Molly , have you tried to remove and set up your email again?
Please make sure that all settings are correct. You can refer to this link: https://www.tpg.com.au/support/emailsetting.php
Have you upgraded Thunderbird which then stopped working?
If so, have a look here:
at the post by David1010.
Also, deleting your account in Thunderbird might delete your saved emails. Unless you can back them up.