This is unclear. Is it Bernie, as head of Infrastructure? Is it SLOBs, as part of granting SoaS a particular status?
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As a SL project, SoaS can get its own mailing list whenever it wants; it's just a matter of someone who is interested in a SoaS mailing list to file the appropriate ticket with Infrastructure and follow up to make sure it's created and the appropriate interested parties join it once it is made.