Suddenly I can't use my identities that I've been using successfully for years.
I get an error message as follows: An error occurred while sending mail. The mail server responded: 5.7.1 From address not allowed. Please verify that your email address is correct in your account settings and try again.
I get an error message as follows: An error occurred while sending mail. The mail server responded: 5.7.1 From address not allowed. Please verify that your email address is correct in your account settings and try again.
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what mail provider? have you checked for a change of policy on their web site?