Select the intended business identity and prepare the recipient addresses, final message and approved attachments. For a setup check, choose an external mailbox that can confirm receipt and reply.

1. Select the business account and choose Write. Inspect the From identity in the new message.
2. Add recipients, a descriptive subject and the message text. Check autocomplete suggestions rather than assuming the first matching name is the correct person.
3. Attach the intended files and review attachment size and sensitivity. Use your organisation's approved sharing method for large or restricted documents.
4. Choose Send once. Check Sent and any Outbox or activity message if it does not complete normally.

Send a small test to a separate mailbox and confirm the delivered sender identity, subject and attachment. A Sent copy alone does not guarantee that a later recipient-side rejection cannot occur.

If incoming email works but sending fails, review the outgoing SMTP server assigned in Account Settings, its authentication details and secure port. If a bounce arrives later, retain the status code and message identifier for support.

• Connecting a Nabtech mailbox to Thunderbird securely
• Checking for new email in Thunderbird
• Creating a business mailbox and connecting your email apps
• Troubleshooting email delivery, spam placement and authentication records

• Thunderbird: sending and receiving email
• Thunderbird: manual account configuration