Werk #18103: check_mail_loop: Allow no authentication for SMTP

Component

Checks & agents

Title

check_mail_loop: Allow no authentication for SMTP

Date

May 28, 2025

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.5.0b1 Not yet released	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.4.0p4	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

When using the active check check_mail_loop to send mails via SMTP, authentication should be optional. This werk fixes the error

RuntimeError: Either Username/Passwort or ClientID/ClientSecret/TenantID have to be set

currently occuring when no authentication for SMTP is configured.