Does not disconnect/reconnect, premature connect.

[azilber]

Having a few issues with this plugin:

1. SMTP is immediately established upon log.Hooks.Add
   This causes a timeout and a Failed to fire hook: write tcp 10.1.1.187:59875->167.114.101.158:25: write: broken pipe error when a log.Alert/Fatal is eventually fired because the server won't hold an SMTP connection forever. Timeouts are usually around 30s to prevent DDOS attacks.
2. If an alert is generated before the SMTP server timeout, then the SMTP connection is not disconnected with a "QUIT". Instead of "QUIT" further "DATA" commands are issued which cause errors.
3. Because there is never a proper termination/reconnection issue 1 or 2 are fatal and logrus_mail never recovers.

Here's a wireshark capture using the public mail.sharklasers.com email host for testing: