Edit the produktive Json file at the rootfolder and add these
"mail": {
"from": "noreply@ domain.tld",
"transport": "SMTP",
"options": {
"service": "mail",
"host": "my.domain.tld",
"port": 465,
"secureConnection": true,
"auth": {
"user": "kontakt@ domain.tld",
"pass": "yourpassword"
}
}
},