Sending your first test message
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Valid postal route required
Make sure you've added a postal route to your customer account for the MTA delivery policy you've created.
The Reply-To and From Email will automatically use the Sender Email Address email, there's no need to edit or change the defaults.
Send test messages to a Gmail address
We recommend testing with Gmail for speed and delivery reliability.
Don't send test messages to Microsoft domains.
Microsoft domains like outlook.com and hotmail.com are known troublemakers who may silently discard your messages despite a successful delivery; this is known as "blackholing."
Don't send test messages to your work email unless it's Google Workspace.
Corporate email providers such as Zoho and other small mailbox providers will be more likely to "quarantine" emails from unknown senders somewhere you can't even find them.
Make sure you have the correct postal route selected for the MTA Delivery Policy which matches your email address configured on the first page.