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incorrect greeting avas01 on sending from thunderbird

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When I try to send an email an error "An error occurred while sending mail: The mail server sent an incorrect greeting: avas01 Cloudmark Gateway ESMTP server not available." It started a week ago

When I try to send an email an error "An error occurred while sending mail: The mail server sent an incorrect greeting: avas01 Cloudmark Gateway ESMTP server not available." It started a week ago

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That is your providers message saying their server is down. Perhaps you might call and ask when it will be fixed.