Send an email to trigger@applet.ifttt.com with " #telegram " in the subject in order to trigger the IFTTT bot, then simply write your message as you would do for a regular email. Target chat needs to be choosen when you turn on the applet.
If
Send IFTTT an email tagged
Send IFTTT an email at trigger@applet.ifttt.com with a hashtag in the subject (e.g. #IFTTT) and this Trigger fires. You can optionally add a single file attachment (up to 30MB) and IFTTT will create a public URL to the file as an Ingredient.
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