Some smtp vendor request a ssl connect but does't require a CA file. …#157

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liguodong wants to merge 1 commit intocihub:masterfrom liguodong:feature-sslEnable

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Commits on Sep 26, 2017

Some smtp vendor request a ssl connect but does't require a CA file. By this situation, there is a new attribute 'sslEnabled' added in smtp writer, and processing separately.
guodong
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