Send a test email
Preview your email template by sending a test email before sending it to all your recipients.
Send a test email to yourself
Prerequisites
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Select Extensions > Yet Another Mail Merge: Mail Merge for Gmail > Start Mail Merge.

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Select your template and click Send test email.

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Click the blue banner to open the test email directly in your Gmail inbox.
infoDelivery may take a few seconds to a minute, depending on the size of your template.
If you've personalized your template with markers, YAMM fills them in using data from the first visible row in your spreadsheet (row 2 by default, or the first unfiltered row if you've applied filters).

Limitations
The test email doesn't fully replicate a live send. The following features are deactivated:
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Unsubscribe link: The link is personalized for each recipient only when you launch an actual campaign. See Insert unsubscribe link.
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Custom reply-to. See Set a reply-to address.
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Alias picker: Gmail uses your primary account. See Set sender and reply-to addresses.
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Cc/Bcc recipients in the spreadsheet: The test goes only to your own account. See Reach multiple recipients per row.
Also, links to Google Docs/Sheets/Slides are previewed at the bottom of the test email. Your recipients won't see this. See Personalize links and images.