This issue should not be marked īsolvedī
I have exactly the same error as the OP...
Iīm using Xubuntu 15.10 with Claws Mail 3.12.0-1ubuntu1 and ufw firewall disabled.
When configuring an IMAP-address itīs unable to auto-configure (failed) and when manually setting all entries receiving email works, but sending fails.
Duplicated these settings in Thunderbird, and automatic IMAP-configuration works flawlessly, both sending and receiving...
Beats me...
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