How to create mailing list
If you need to send a message to a group of people, you can create a Mailing list. Click To: and select recipients from the Address book (Contact folder, TeamChat room) 
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/Mailing list.png)
Figure. Selecting recipients for the mailing list.
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You can also send the copy to visible / hidden recipients, click Cc:/ Bcc:
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If you have the administrator rights in WebClient, you can create groups with pre-set group of accounts.
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If you select contacts from Teamchat room, you will see the list of the TeamChat rooms.
Note: If you have a planned meeting, you can send messages to all attendees. Right-click the meeting > 
More options > Email attendees.
