Check manual page of check_mail_loop

POP3/IMAP Connection and Optional Mail Forwarding

Included in	All Checkmk editions
Source Code License	Open Source
Supported Agents	Active

Sends out special emails to a defined mail address and then tries to receive these mails back by querying the inbox of a mailbox. With this check you can verify that your whole mail delivery process is working.

The following protocols and authentication methods are supported for sending:

SMTP: Username/password (basic authentication).

EWS (Exchange Web Services): Username/password (basic authentication) or OAuth2 using ClientID, TenantID, and a client secret.

Microsoft Exchange Online (Graph API): Microsoft Entra ID authentication via an OAuth2 connection. The connection can be configured directly in the check rule or managed centrally via Setup > Microsoft Entra ID connections and then referenced in the rule. In distributed environments, the OAuth2 connection can be created on the central site while the OAuth2 authentication process (redirect URI) is handled by a different remote site. The site used for the authentication redirect can be selected when configuring the OAuth2 connection.

The same protocols (except SMTP) and authentication methods are supported for receiving, with IMAP and POP3 added as additional options (basic authentication only).

This check can be configured using WATO.

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