rfc821

**Plan 1:** Do not have the pip command. But used ```pip3 list``` instead: ``` Package Version ---------------------------------- --------- altgraph 0.17.2 azure-common 1.1.28 azure-communication-administration 1.0.0b4 azure-communication-email 1.0.0 azure-communication-identity 1.3.1 azure-core 1.29.4...