I keep getting text messages such as "Important notice: We're unable to send you emails (inc passowrd resets) until you update your email address..." but my email address is valid and I got the welcome email and am getting promotional emails from them. I checked my spam and there are no messages from them there. Do I need to use another less convenient email address since they are having problems?
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You will get these messages if an email giffgaff try to send you is bounced for any reason - this could happen to any email address if (for example) your inbox is full, or your provider's service is not available due to maintenance etc.