Hi,
I’m using SMTP server from OVH. I created login, password and opened discourse-setup file. After all, I do rebuild, but Discourse still don’t send mails. I saw topic on meta, but change configuration still don’t help.
Can anyone help?
Thanks!
Sorry for my English
Use one of the recommended email services.
My guess is that the domain name you are using is not approved by the mail host. By defaul Discourse will send from the host name of the site. Mail server is probably set for example.com and Discourse is using forum.example.com. There is a line at the bottom of the configuration file to change it.
Where? 
Yeah, mail serwer is smtp.example.com and I use forum.example.com
I managed to succeed with OVH, you have to add some things.
With a pro mail server (fr - uk)
DISCOURSE_SMTP_ADDRESS: pro1.mail.ovh.net
DISCOURSE_SMTP_PORT: 587
DISCOURSE_SMTP_USER_NAME: email@forum.com
DISCOURSE_SMTP_PASSWORD: "password"
DISCOURSE_SMTP_ENABLE_START_TLS: true # (optional, default true)
DISCOURSE_SMTP_AUTHENTICATION: login # (you need to add this line)
If you have a classic web hosting alongside the forum
DISCOURSE_SMTP_ADDRESS: ssl0.ovh.net
DISCOURSE_SMTP_PORT: 587
DISCOURSE_SMTP_USER_NAME: email@forum.com
DISCOURSE_SMTP_PASSWORD: "password"
#DISCOURSE_SMTP_ENABLE_START_TLS: true # (optional, default true)
But if you have a dedicated smtp server, can’t help, sorry
It should work
It don’t work 
What offer did you use with OVH to access a webmail account?
If you only have a vps, they don’t provide a smtp account
This is free webmail. I have this with domain.
Your forum is in https? The port can change if it’s not the case
Yes
Should I change port? Whose port?
No, my examples are with forum on https.
You should contact OVH or check your guide in the webmail to know what smtp you have to put