Try to send test message. Click Mail sender from the Tools tab of the ribbon. Click New to create a new message. Message composing window appears:

At the top you select E-mail account to use to send a message (default e-mail account automatically selected for new messages). Date represents a moment of a message creation. It is assigned automatically, but you can change it when needed. Message sent selector shows sending status of the message. After sending, it will be automatically changed to Sent.

In the Subject field you specify conventional message subject.

Require read notification flag allows to add read confirmation to a message. However, not all e-mail clients support this feature. In addition, message recipient can deny sending confirmation, so it may happen that you would not get it anyway. More to say, including of read notification request into your message may be negatively perceived by a recipient, as it does not seem to be a good tone in mail conversations.

The rest of space is occupied by the message editing box. Formatting toolbar contains a set of buttons provided by any modern text editor.

SDL Trados Business Manager has extensive mechanism of message templates and variables. To apply one of message templates, click Apply template text on the ribbon and select a template.

To create a new template, go to Reference data > Message templates and create a new template. Or click Save as a template button on the ribbon to save current message as a template. Template creation process from the reference data table is similar to message composing, so it doe not require additional description.