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I use Thunderbird for 16 accounts at the same time. Its a breeze.
If it can't reach the server it has zero to do with Thunderbird. 3 main options:
1- If new account, you have something set incorrectly. Maybe server calls for TSL or different port, etc.
2- If older account, maybe the mail server that sends the mail is simply down. Happens often.
3- If you are away from your normal location (say in a hotel), those places often block the main email port (25) to avoid people doing spamming on their networks.
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