every time i try to send an email it tells me the address cant be found
iam unable to send any emails it tells me that the email address is invalid
iam unable to send any emails it tells me that the email address is invalid
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More details are needed. Specfically, we need to know what "it" is in "it tells me". One way to do that is post a screen shot. https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem