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An mweb address in South Africa keeps sending my emails back!

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Email to johnhefer@mweb.co,za and alisonhefer@mweb.co.za keep being returned to us. For years we have used these addresses with no problem but for the past weeks they are being returned to us - say they are blacklisted. Please will you unblock these email addresses. Thank you for your help.

Email to johnhefer@mweb.co,za and alisonhefer@mweb.co.za keep being returned to us. For years we have used these addresses with no problem but for the past weeks they are being returned to us - say they are blacklisted. Please will you unblock these email addresses. Thank you for your help.

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Thunderbird is email client software running on your computer. It does not have the ability to block anything. I am sure that the error also tells you do contact your Internet Service Provider or email provider. I suggest you start there.