chengshiwen opened a new pull request #4711:
URL: https://github.com/apache/incubator-dolphinscheduler/pull/4711
## What is the purpose of the pull request
**Fix sql task do not execute and send mail failed exception under default
mail config**
This closes #4710
## Brief change log
- *Fix sql task do not execute and send mail in docker*
- *Fix exception to send mail failed under default mail config*
## Verify this pull request
This change added tests and can be verified as follows:
*(example:)*
- *Manually verified the change by testing locally by @chenxingchun and
@chengshiwen *
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