pip install odoo12-addon-website-mass-mailing-name==12.0.1.0.0.99.dev5

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Source
Among fairly niche packages on PyPI.
Over 348 downloads in the last 90 days.

Version usage of odoo12-addon-website-mass-mailing-name

Proportion of downloaded versions in the last 3 months (only versions over 1%).

12.0.1.0.0.99.dev5

37.36%

12.0.1.0.0.99.dev3

21.84%

12.0.1.0.0.99.dev2

20.98%

12.0.1.0.0.99.dev1

19.83%