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'x' mailing list is not a valid e-mail address because it is not of the form user@host. You must correct it before sending the e-mail.

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I have created a mailing list; when I am trying to send an outgoing message to this list I am receiving this notification: 'x' list is not a valid e-mail address because it is not of the form user@host. You must correct it before sending the e-mail.

I have created a mailing list; when I am trying to send an outgoing message to this list I am receiving this notification: 'x' list is not a valid e-mail address because it is not of the form user@host. You must correct it before sending the e-mail.

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If the 'mailing list' consists of more than one word with a space in between words, replace the space between the words with an underscore _.