Here are several things you can do to reduce the chances that your emails will be marked as spam:

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1. Obtain explicit permission from recipients before sending them any email.
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2. Make sure your From address displays a credible name or domain name that your recipients will recognize.
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3. Maintain your email list so that any bad or inactive email addresses are removed.
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4. Make sure your email contains a valid, working Unsubscribe link to allow recipients to opt-out of your emails.
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5. Check links, images, and any web forms used in your emails are functioning properly.
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6. Keep your Subject short and informative.
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7. Do not use words or phrases that may trigger spam filters.
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8. If including hyperlinks in your emails, use a trusted, genuine domain.