Problem with SMTP Mail verification

Hi,

I try to use a custom Mail Server to send emails to user, to verify login. I tried different settings but always get this error:

Here are my configs:

And here is my log:

{"timestamp":"2024-10-04 08:21:06.130 Z","level":"warn","msg":"Error decoding the config","caller":"api4/system.go:207","path":"/api/v4/email/test","request_id":"cii43nktxiffteigjih3eg8kwe","ip_addr":"172.18.0.3","user_id":"1rd9yxud3tbumd5b6kngjgpduo","method":"POST","error":"EOF"}
{"timestamp":"2024-10-04 08:21:16.133 Z","level":"error","msg":"Connection unsuccessful: unable to connect to the SMTP server: dial tcp 162.55.254.207:587: i/o timeout","caller":"web/context.go:117","path":"/api/v4/email/test","request_id":"cii43nktxiffteigjih3eg8kwe","ip_addr":"172.18.0.3","user_id":"1rd9yxud3tbumd5b6kngjgpduo","method":"POST","err_where":"testEmail","http_code":500,"error":"testEmail: Connection unsuccessful: unable to connect to the SMTP server: dial tcp 162.55.254.207:587: i/o timeout"}

I’ve double-checked the configuration of my web server, and everything seems to be set up correctly. However, I’m still encountering the issues. I would really appreciate any guidance or help you can provide.

One more thing, I am using caddy (as a reverse Proxy) with the following settings:

mattermost.techmountain.dev {
   reverse_proxy mattermost:8065
}

I already asked this question here:

Mattermost Community

Thank you

Best regards,
lemmi25

Start with the /api/v4/email/test request and the log locations api4/system.go:207 and web/context.go:117. Check the reported SMTP connection timeout and the Docker deployment and Caddy reverse-proxy configuration. This issue does not define a code change or a clear completion condition; done would require identifying and documenting the cause or a verified configuration fix.