Self-hosted gitlab mattermost smtp settings with ovh

revelant config 2
/var/opt/gitlab/mattermost/config.json
“EmailSettings”: {
“EnableSignUpWithEmail”: true,
“EnableSignInWithEmail”: true,
“EnableSignInWithUsername”: true,
“SendEmailNotifications”: true,
“UseChannelInEmailNotifications”: false,
“RequireEmailVerification”: true,
“FeedbackName”: “chatons-vaucluse-libre”,
“FeedbackEmail”: “correct_email”,
“ReplyToAddress”: “correct_email”,
“FeedbackOrganization”: “”,
“EnableSMTPAuth”: true,
“SMTPUsername”: “correct_email”,
“SMTPPassword”: “***”,
“SMTPServer”: “ssl0.ovh.net”,
“SMTPPort”: “465”,
“SMTPServerTimeout”: 10,
“ConnectionSecurity”: “TLS”,
“SendPushNotifications”: true,

“PushNotificationContents”: “full”,
“PushNotificationBuffer”: 1000,
“EnableEmailBatching”: true,
“EmailBatchingBufferSize”: 256,
“EmailBatchingInterval”: 30,
“EnablePreviewModeBanner”: false,
“SkipServerCertificateVerification”: true,
“EmailNotificationContentsType”: “full”,
“LoginButtonColor”: “#0000”,
“LoginButtonBorderColor”: “#2389D7”,
“LoginButtonTextColor”: “#2389D7
},