When you send an email using LSP.expert, the email is sent from mail@lsp.expert, and when the recipient hits Reply, their email is sent to your own email address. 

But we also offer an integration with Gmail/Office 365 Outlook and with your SMTP server. By connecting your Gmail/Office 365 Outlook account or your SMTP server to LSP.expert, the emails will be sent from your own email address and stored in your own ‘Sent’ mail folder.