Check that the device has internet access and that webmail works. Confirm the full email address, mailbox password, incoming and outgoing server names, secure ports, encryption method, and SMTP authentication.
Also check mailbox storage usage, spam folders, domain MX records, and whether the domain is active. A bounced message normally contains the most useful error details. If the problem continues, open a support ticket with the sender, recipient, approximate time, and complete bounce error, but do not include the mailbox password.
