Have the recipient's complete address, intended From identity and final attachments ready. For a setup check, choose an external mailbox you control or a colleague who can confirm the received message and reply.

1. Select your business mailbox and tap Compose. Check the From address before adding recipients.
2. Enter the full recipient addresses and a clear subject. Use Cc only for people who should be visible to one another; use an approved mailing service for bulk campaigns.
3. Write the message and attach only the intended files. Review the size and contents before sending confidential or customer information.
4. Send once, then check that the message leaves the Outbox and appears in Sent. If it remains queued, note the displayed connection or authentication error.

For a setup test, send to a separate mailbox and request a reply. Check the delivered From address and attachment before using the account for normal business mail.

A stuck Outbox can indicate network or SMTP authentication problems. A later bounce contains server-delivery information and should be investigated using its status code. Do not keep pressing Send while uncertain whether the original message was accepted.

• Adding a Nabtech IMAP mailbox to Gmail on Android
• Refreshing an Android business mailbox and diagnosing missing sync
• Controlling background sync and notifications for Gmail on Android
• Creating a business mailbox and connecting your email apps
• Reading and finding business email in Gmail on Android
• Setting an account-specific business signature in Gmail on Android

• Google: Gmail app settings
• Google: adding a non-Google account to the Gmail app