Related Questions:
It won't let me press the send button
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Why are buttons blocked on an email?
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I am having trouble sending emailed invoices through event temple
Answer:
When sending an email, there must be an email address in the 'to' field.
If no Contact has been selected, or a Contact with no email address has been selected, you will not be able to send the email.
Similarly, if the Subject Field is empty you will not be able to send the email. Please add a Subject line and try again.