Put email in queue and send it one by one, by limits.
More Plugins
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GenTime: Inspect page generation time
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Remote Website Management Plugin by Watchful
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Hide Admin Bar Search
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MZR Buy X Pay Y
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Tag Cloud Shortcode
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Subscribe-YouTube-Button
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Shop Currency Switcher for WooCommerce
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BlossomThemes Toolkit
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Widget Click to Chat
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Advanced Custom Fields: Image Size Select Field
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MP Booking
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Date Range Filter
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Add to Calendar Button
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Mini WP GDPR
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Word Count Analysis
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VA Removing Exif
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EZ Coming Soon
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Snow Monkey Forms
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ShMapper by Teplitsa
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OrderStorm WordPress e-Commerce