I want to send email using powershell, can you please share the code and steps
This isn’t a Powershell forum, but I believe you can use Send-MailMessage.
For help on this I would suggest looking at other resources online
Once you have a .ps1 script then if desired you can use the Run Powershell activity to call it in UiPath.
404 application error
I believe this is the correct link: https://github.com/UiPath/Community.Activities/blob/master/Script/UiPath.Script.Activities/PowerShell/RunPowerShellScript.cs