Thanks for your inquiry.
I think your question is better suited to the Aspose.Network team. I have moved your query to their forum and someone will assist you there shortly.
Thank you for inquiry.
Could you please clarify the question?
If you want to send multiple MSG files through email, you can attach these MSG files using MailMessage.Attachments.Add() method and send using SmtpClient.Send().
And if you want to send email to more than one recipients, at the same time, you can just add multiple recipients in MailMessage.To.
You can also do mail merge and send bulk emails. Please click here for documentation and code sample.