Put email in queue and send it one by one, by limits.
More Plugins
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FlyWP Helper – Page Cache, Page Optimization, Emails for FlyWP Server Control Panel
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Hotelipp
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WP Headless
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Last Updated Shortcode
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zipaddr-jp
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REST API for Relevanssi
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RaCar Message Me
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OpenAgenda
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Currency Converter for WooCommerce
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Simple Text Shortcodes
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Reading time by LavaDESIGN
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Menu Breadcrumb
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Static Porter
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Alt Text Tools
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Eli's PHP Compatibility Scanner
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Great Circle Mapper
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Deploy & Sync Content
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Voizee
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EZ Countdown Timer
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ja WowToken