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Answer by Michael for How to modify the image size in RSS (mailchimp...
$thumbnail = wp_get_attachment_image_src( $thumbnail_ID, 'full' ); https://codex.wordpress.org/Post_Thumbnails
View ArticleHow to modify the image size in RSS (mailchimp compatibility)?
I am using the following code in my functions.php and it shows the thumbnail properly in my mailchimp's campaign test email ... function dn_add_rss_image() { global $post; $output = ''; if (...
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