@leojohn
In AEM cloud there is no way that you will be able to access to configMgr or filex console as it is restricted.
Only way to update the SMTP configuration is through the config deployment through cloud. How every as part of the implementation you can set the SMTP variables as an environment variables so that in future you can change the variables directly in the environment and change the configurations
https://experienceleague.adobe.com/docs/experience-manager-cloud-service/content/implementing/deploy...
Code snippet:
ui.config/src/main/content/jcr_root/apps/<Project>/osgiconfig/config/com.day.cq.mailer.DefaultMailService.cfg.json
{
"debug.email": false,
"smtp.user": "$[secret:smtpuser]",
"smtp.password": "$[secret:smtppassword]",
"smtp.port": 465,
"smtp.ssl": true,
"smtp.starttls": true,
"smtp.host": "in.mailjet.com",
"from.address": "noreply@XXXXX.com"
}
Set environment variable
https://experienceleague.adobe.com/docs/experience-manager-cloud-service/content/implementing/using-...