Telnet is an application layer protocol that is used on the internet or local area networks to provide an interactive text-oriented communication facility.

For PC users, open a Telnet session by using the Command prompt interface.

1. At the taskbar, select Start.
2. Choose Run.
3. Type CMD. In some versions of Windows, type COMMAND.
4. Type telnet.

For Transact SMTP emails in Acoustic Campaign, users can use the Telnet interface to send Transact automated emails with IP address, or subject and from address event trigger.

1. In Org admin > Security settings > Access restrictions, ensure that your IP address is added to the allowed IP list. Allow a few minutes to wait for the data to synchronize over to the Transact server.
2. Use telnet transact-campaign-us-[X].goacoustic.com 25 to open a connection from your computer to your mail server. For more details, see the complete list of updated Transact URLs.
3. Declare where you are sending the email from by using HELO local.domain.
4. Enter your email address: MAIL FROM: mail@domain.com
5. Give the recipients address: RCPT TO: mail@otherdomain.com
6. To start composing the message, type the command DATA.
7. Type the body of your message.
8. Provide any necessary standard email headers. If needed, provide custom headers. Then, type the body of your message.
9. In the following example, it shows an optional x-header.

Note: Optional x-headers are only used for SMTP sends that are triggered through the X-header method.

From: mail@domain.com
To: mail@otherdomain.com
Subject: This is my Transact SMTP Message Subject
X-SP-Transact-Id: mycustomxheadervalue
This is the body of my message.

1. To tell the mail server that you completed the message, enter a single '.' on its own line. The system queues the message and is sent when it is processed by the SMTP server.
2.  To close the connection, enter the QUIT command.

The email that you send from Telnet interface is in TEXT email body. Configure the automated message group with Send text as HTML to Yes.