To send email use this cmdlet:

Send-MailMessage [-To] <string[]> [-Subject] <string> [[-Body] <string>] [[-SmtpServer] <string>] -From <string> [-Attachments <string[]>] [-Bcc <string[]>] [-BodyAsHtml] [-Encoding <Encoding>] [-Cc <string[]>] [-DeliveryNotificationOption <DeliveryNotificationOptions>] [-Priority <MailPriority>] [-ReplyTo <string[]>] [-Credential <pscredential>] [-UseSsl] [-Port <int>] [<CommonParameters>]

The Send-MailMessage cmdlet sends an email message from within PowerShell.

You must specify a Simple Mail Transfer Protocol (SMTP) server or the Send-MailMessagecommand fails. Use the SmtpServer parameter or set the $PSEmailServer variable to a valid SMTP server. The value assigned to $PSEmailServer is the default SMTP setting for PowerShell. 

Example 1: Send an email from one person to another person

Send-MailMessage -From 'User01 <user01@fabrikam.com>’ -To 'User02 <user02@fabrikam.com>’ -Subject 'Test mail’

Example 2: Send an attachment

Send-MailMessage -From 'User01 <user01@fabrikam.com>’ -To 'User02 <user02@fabrikam.com>’, 'User03 <user03@fabrikam.com>’ -Subject 'Sending the Attachment’ -Body „Forgot to send the attachment. Sending now.” -Attachments .\data.csv -Priority High -DeliveryNotificationOption OnSuccess, OnFailure -SmtpServer 'smtp.fabrikam.com’

Example 3: Send email to a mailing list

Send-MailMessage -From 'User01 <user01@fabrikam.com>’ -To 'ITGroup <itdept@fabrikam.com>’ -Cc 'User02 <user02@fabrikam.com>’ -Bcc 'ITMgr <itmgr@fabrikam.com>’ -Subject „Don’t forget today’s meeting!” -Credential domain01\admin01 -UseSsl

More info:

https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.utility/send-mailmessage?view=powershell-6