PIM Manager settings · Settings > Mail & alerting

How PIM Manager sends mail

Key	Mail.Mode
Where	Settings > Mail & alerting > Mail sending (also Get Started > Mail sender)
Type	Choice
Default	Shared mailbox

What it does

Picks the one transport every PIM Manager mail uses -- TAP codes, approval and review mails, alerts, the daily digest and the tier report. Shared mailbox sends through Microsoft Graph as the environment's own identity from one Exchange Online mailbox. SMTP relay sends through a mail server you already run. None switches mail off.

When set

When set: Shared mailbox needs the sender mailbox filled in; SMTP relay needs server, port and From address. The PIM Manager uses the new choice at once; scheduled jobs and the engine pick it up on their next run. Choosing None makes every send return 'not sent' -- new admin accounts then cannot receive their TAP by mail, and the engine reports that instead of pretending it was delivered.

When blank or default

At the default (Shared mailbox) and with no sender mailbox set, mail is rendered but not sent, and the Alerting card and Get Started show 'configure to enable'.

Risk and how to reverse it

None (or a broken relay) silently stops all PIM mail, including alerts about failures and TAP codes for new admins. The None option only appears in the form when mail is already off, so in practice you switch between Shared mailbox and SMTP relay. Reversible: pick another mode and save; mails that were not sent meanwhile are not re-sent.

Requires

Admin role in PIM Manager. Shared mailbox: an Exchange Online plan and a one-time setup by an Exchange or Global Administrator that grants Mail.Send scoped to that one mailbox (never tenant-wide). SMTP relay: a reachable relay and, if it needs sign-in, the password in Key Vault. The Email alerting feature (Settings > Feature customization) must be on, or nothing is sent in any mode.