I have sorted all my email contacts into certain groups in my Address Book. I don’t think there’s any mistake in the contact details. I mean, there are no email ids in contact no. list or anything like that. Things look perfectly fine and I can’t make out what the cause of the problem is. By the way, the problem is that I whenever I try to send an email to any group it shows an error message that so-and-so group doesn’t have valid mail ids.
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