Fix error opening email list (Close #247)

[fisuda]

Proposed changes

This PR fixes error opening email list.

Related issue: #247

Types of changes

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• [X] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

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• [X] I have read the CONTRIBUTING doc
• [ ] I have signed the CLA
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation (if appropriate)
• [ ] Any dependent changes have been merged and published in downstream modules

Further comments

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