Error: “cannot decode raw data”

For the second time in about a week, my subscribers have alerted me that they are unable to follow the “read more” link in my post notification emails. The email itself looks fine but when they click on “read more” to go to the post on my site, they receive an error that says: Safari cannot open the page. The error was “cannot decode raw data.” This is a recent development. These subscribers have previously been able to follow these links from my emails. Additionally, I have verified that my site is working with Safari.

Copy and paste of System Info:

name: mwgerard
email: [email protected]
PHP version: 7.1.33
MailPoet Free version: 3.46.1
MailPoet Premium version: N/A
MailPoet Premium/MSS key: 1be930f8140417af42779d6e09583c1c
WordPress version: 5.3.2
Database version: 5.6.40-84.0-log
Web server: Apache
Server OS: Linux us11.siteground.us 3.12.18-clouder0 #1 SMP Tue Oct 9 18:14:47 EEST 2018 x86_64
WP_MEMORY_LIMIT: 40M
WP_MAX_MEMORY_LIMIT: 768M
WP_DEBUG: false
PHP max_execution_time: 120
PHP memory_limit: 768M
PHP upload_max_filesize: 128M
PHP post_max_size: 128M
WordPress language: en_US
Multisite environment?: No
Current Theme: Edge Child (version 1.1.1.0.1527257825)
Active Plugin names: akismet/akismet.php, better-font-awesome/better-font-awesome.php, category-page-extender/category-page-extender.php, category-posts/cat-posts.php, child-theme-configurator/child-theme-configurator.php, classic-editor/classic-editor.php, contextual-related-posts/contextual-related-posts.php, font-awesome/font-awesome.php, font-squirrel/index.php, ga-google-analytics/ga-google-analytics.php, iframe-shortcode/iframe-shortcode.php, insert-html-snippet/insert-html-snippet.php, instagram-feed/instagram-feed.php, java-applet-embed/java-applet-embed.php, jetpack/jetpack.php, mailpoet/mailpoet.php, page2cat/page2cat.php, portfolio-filter-gallery/portfolio-filter-gallery.php, posts-for-page/posts-for-page.php, primary-feedburner/index.php, rss-links-manager/rss-links-manager.php, sg-cachepress/sg-cachepress.php, so-widgets-bundle/so-widgets-bundle.php, spacer/index.php, ssl-insecure-content-fixer/ssl-insecure-content-fixer.php, theme-check/theme-check.php, tinymce-advanced/tinymce-advanced.php, tumblr-widget-for-wordpress/tumblr-widget.php, tweet-old-post/tweet-old-post.php, use-any-font/use-any-font.php, video-embed-thumbnail-generator/video-embed-thumbnail-generator.php, wp-google-fonts/google-fonts.php, wp-smushit/wp-smush.php, wp-super-cache/wp-cache.php, wp-super-edit/wp-super-edit.php, wp-tumblr-embeder/wp-tumblr.php
Sending Method: MailPoet
Sending Frequency: 70 emails every 15 minutes
Task Scheduler method: WordPress
Cron ping URL: https://mwgerard.com?mailpoet_router&endpoint=cron_daemon&action=ping
Default FROM address: [email protected]
Default Reply-To address: [email protected]
Bounce Email Address: [email protected]
Total number of subscribers: 55
Plugin installed at: 2015-04-10 12:31:54

The page I need help with: [log in to see the link]