## The problem
Issue SigNoz/signoz#7580 (closed, 20 comments): On a self-hosted SigNoz in Kubernetes, configuring SMTP for alert notifications does not work. The reporter set the documented variables (SIGNOZ_ALERTMANAGER_SIGNOZ_GLOBAL_SMTP__SMARTHOST, __FROM, __AUTH__USERNAME, __AUTH__PASSWORD) via alertmanager additionalEnvs in the helm values, following the configuration docs, and mail still never went out.
## What fixed it
Fixed in v0.101.0, per maintainer Nageshbansal (details in SigNoz/signoz#8478). If you are on an older self-hosted release, the SMTP alert path is the thing that is broken, not your values.yaml: upgrade to v0.101.0 or newer first. Then set the SIGNOZ_ALERTMANAGER_SIGNOZ_GLOBAL_SMTP__* variables as alertmanager additionalEnvs in your helm values (SMARTHOST as host:port, FROM address, AUTH USERNAME and PASSWORD) and the alertmanager picks them up for alert notifications.