For some reason, one cannot send emails with that @xtra mail address. Well, there may be some potential causes and a few things you can do to fix the situation. Start with checking whether the configuration of your email account is done properly. The outgoing (SMTP) server should be smtp.xtra.co.nz using Port 465 with SSL switched on, with your full @xtra email address used as the username. Improper configurations of the SMTP are often a reason for ‘send’ problems.
In the next step, check your internet connectivity, as low bandwidth may result in problems when sending out emails. In case you are using an email application or email clients like Outlook or Apple Mail, ensure that the application is brought to date with the latest release as this may prevent some problems of cross-compatibility. At times some emails are not sent due to certain contents, for example, the subject or attachments that contain words that email servers have been programmed to disallow. Change the subject or the body of the email and send it again.
If none of these steps help, try to go through a common sense step of restarting the device or turning off any application or system that has a potentially negative effect like the firewall, the firewall may also be an obstacle to sending messages. If the issue still remains, Spark has a skilled customer service team who will walk through several troubleshooting steps and ensure that the settings of your email account are optimized.
More Info: https://resetxtrapassword.com/
More Info: https://resetxtrapassword.com/reset-your-xtramail-username-or-email-password/