Jeremy Stanley 4db9e9f208 Add a specification for Mailman 3 ...

This is intended to cover design, testing, deployment, and migration
for a Mailman 3 based successor to our current Mailman 2 services.

Change-Id: I3eed68b8f0c5e429a8e5ddc5791af20183de3231
Task: #43433

2021-11-03 15:21:04 +00:00

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Add a specification for Mailman 3

2021-11-03 15:21:04 +00:00