I can receive mail but can not send mail
We have a Charter Business account. All of our email programs can receive email but none can send. When I call Charter they say the problem is with the email program and not them since we can send from their web portal. When send we get the message smtp.charter-business.net has timed out.
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https://support.mozilla.org/en-US/kb/cannot-send-messages
Webmail has got nothing to do with it, and is completely independent.