Outgoing Email Server Extension allow each user to have his/her own Outgoing Email Server(SMTP). Email server settings can be configured by admin, or each user can do it for him/herself. It supports IMAP function, meaning that every email sent will also be stored in user’s “Sent” folder on webmail/email server.
How to Setup Multiple Email (SMTP) Servers Per User
Go to My Preferences and click on the “Outgoing Server” button. Click on the “Create” button and Configure the Outgoing Mail Server. You can add more then One Email or Different Emails for each User.
Now open a contact and click on the “Send Email” button. You can send Email on behalf of these two accounts. Select the Email account you want to send the mail from.
Here you can see this mail is sent from the 2nd Email ID using VTiger Outgoing Mail Server.