I'd just like to add that this bug also affects the calendar. Following the debugging steps posted by hggdh, I found this in the output file explaining the problem:
e-data-server-ui-Message: Unable to find password(s) in keyring (Keyring reports: No matching results) e-data-server-ui-Message: Key file does not have group 'Passwords-Calendar' -- evolution asking for a password, even though it should be remembered https://bugs.launchpad.net/bugs/255768 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
