It turns out the sysadmin mail alias turned to a mailbox since the move to soverin.
I've filed a ticket about that: https://trac.osgeo.org/osgeo/ticket/3651
What was the rationale for the switch ? Shall we go back to alias-like ("forward", in Soverin terms) ?
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Sent from hand-held device with K-9 Mail. Please excuse my brevity.