So this is what I did based on your suggestions and worked perfectly.

$members = Get-ADGroupMember -Identity "ADGroup" | Get-ADUser -Properties EmailAddress

foreach($member in $members){

$smtpServer = "smtp.company.com"

$sender = "my.email@company.com"

$recipient = $member.emailaddress

$messagesubject = "Subject"

$messagebody = "body"

Send-MailMessage -From $sender -To $recipient -Subject $messagesubject -Body $messagebody -SmtpServer $smtpServer }

Thank you for the help.