Thunder bird some times returns to me [or is it an ISP] a mail with the message 'This must contain a domain name' This is with an address with which there has been no previous problem. Also this can happen when I sent to a 'group' of addresses under cc. or bcc Here there is no indication whether the whole batch failed or an individual addressee. In these circumstances I do not uder stand what is ment by 'Domain name' This surely refers to the type of address. Co.Uk/Com/org etc.
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