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	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT
2.4.0p4	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

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.