Allow sender to immediately hangup after QUIT message #344
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This fixes a problem where the gen_smtp_server crashes if the client sends a QUIT message and immediately hangs up before the "221 Bye" can be send. This is done by ignoring any send errors.
In the client: be a bit more subtle when receiving funky multiline replies. Do not immediately crash but just throw an "unexpected_response" exception.
Use OTP 25 for docs build, as ex_doc requires it.