Optimal Number of Service Accounts for multiple email mailboxes

I have been asked by a customer whether 7 service accounts for 310 mailboxes is an optimal setup to ensure stable service? Can anyone with experience of this please provide any feedback.

Hello Ian,

Thank you for reaching out with your question! We truly appreciate your participation in the community.

Your query has been assigned to a Subject Matter Expert (SME), who will review it and provide guidance as soon as possible.

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Saurav S.
Community Moderator

Hello @IFirth
Here’s a response from the SME:
“Service account to mailbox ratio should not affect service stability, but we recommend 50 emails per service account for better organization.”