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Hi there and welcome to Just Answer, my name is ***** ***** I look forward to helping you.
I’m sorry to hear you're having trouble. I know that can be frustrating. Hopefully, we can get this resolved quickly.
Can you please go to www.whatismyip.comNote your IP address down there.Then go to https://mxtoolbox.com/blacklists.aspxAnd put in your IP address and see if you are blacklisted (it will show it in red).If so, this is why you cannot send on the computer and in this case you would need to contact your internet provider in order to get the public IP address you have changed.Let me know how you go pleaseThank you