Thunderbird unable to connect to the IMAP server

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Greetings. I've been using thunderbird but today, it started to trouble as it give the error message saying ''unable to connect to the IMAP server
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Posts
50325
Registration date
Monday February 1, 2010
Last seen
November 22, 2018
0
Thank you
Hello

The outgoing message server is probably down for maintenance.

I suggest you be patient. Let us know in 8 hours.
Respond to Ambucias
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12
Registration date
Tuesday December 4, 2018
Last seen
December 11, 2018
0
Thank you
Unable to connect to IMAP server it means that you may have exceeded the number of connections to this server.
So, Change the default number of IMAP connections to 1.
Go here to change it:
Edit > Account Settings > Server Settings (under the mail account for which the setting should be modified) > Advanced > Maximum Number of server connections to cache.

I hope it will be helpful for you
Respond to Somitsvk