This looks like a configuration problem in evolution.
See https://answers.launchpad.net/ubuntu/+source/firefox/+question/3038
Could you please check the pop3 and smtp server settings and report them?
Please provide details about your email account, are you using yahoo mail with
pop3 (yahoo Mail Plus) or is your ISP using yahoo mail?
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Evolution will not send mail - "error: broken pipe"
https://bugs.launchpad.net/bugs/381915
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