> For the complete documentation index, see [llms.txt](https://docs.powerembedded.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.powerembedded.com/power-embedded-documentacao/portal-de-relatorios/problemas-mais-comuns/the-smtp-server-requires-a-secure-connection-or-the-client-was-not-authenticated.-the-server-respons.md).

# The SMTP server requires a secure connection or the client was not authenticated. The server respons