sending limits in legacy plan?

Good morning,

despite having everything setup correctly and no errors are shown, the sending of our newsletter is quite poor (unusual low response rate). It seems, that out of 164 subscribers only 24 got the email (see screenshot): https://stefankremer.cloud/index.php/s/54rGWjbfm9wgAzH

Been through this: https://kb.mailpoet.com/article/231-sending-does-not-work but with no success:

• sender email domain is authorized
• sender domain is verified
• test email can be send and arrives
• system status doesn’t show any errors
• ping for cron_daemon is successful

sys info says:

name: AdminPress
email: [email protected]
PHP version: 8.1.15
MailPoet Free version: 4.7.1
MailPoet Premium version: 4.7.0
MailPoet Premium/MSS key: b1625f43bab67adf**
WordPress version: 6.1.1
Database version: 10.5.18-MariaDB-0+deb11u1-log
Web server: Apache
Server OS: Linux s246.goserver.host 5.10.0-20-amd64 #1 SMP Debian 5.10.158-2 (2022-12-13) x86_64
WP info: WP_MEMORY_LIMIT: 40M - WP_MAX_MEMORY_LIMIT: 256M - WP_DEBUG: - WordPress language: de_DE
PHP info: PHP max_execution_time: 120 - PHP memory_limit: 256M - PHP upload_max_filesize: 150M - PHP post_max_size: 150M
Multisite environment?: No
Current Theme: Ulrike Krasemann (version 1.6.9)
Active Plugin names: koko-analytics/koko-analytics.php, git-updater/git-updater.php, iwp-client/init.php, admin-menu-editor-pro/menu-editor.php, apcu-manager/apcu-manager.php, codepress-admin-columns/codepress-admin-columns.php, custom-fonts/custom-fonts.php, duplicate-post/duplicate-post.php, duplicator-pro/duplicator-pro.php, erecht24-1/erecht24.php, fullscreen-mode-b-gone/fullscreen-mode-b-gone.php, gutenslider/eedee-gutenslider.php, health-check/health-check.php, host-webfonts-local/host-webfonts-local.php, imagify/imagify.php, ithemes-security-pro/ithemes-security-pro.php, luckywp-table-of-contents/luckywp-table-of-contents.php, mailpoet-premium/mailpoet-premium.php, mailpoet/mailpoet.php, qsm-theme-serene/qsm-theme-serene.php, quiz-master-next/mlw_quizmaster2.php, simple-history/index.php, ultimate-addons-for-gutenberg/ultimate-addons-for-gutenberg.php, user-switching/user-switching.php, welcome-to-the-block-editor-b-gone/welcome-to-the-block-editor-b-gone.php, wordpress-seo/wp-seo.php, wp-rocket/wp-rocket.php, wpforms-lite/wpforms.php
Sending Method: MailPoet
Sending Frequency: 25 emails every 5 minutes
MailPoet sending info: Send all site's emails with: current sending method - Task Scheduler method: Action Scheduler - Cron ping URL: https://ulrikekrasemann.de?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: 166
Plugin installed at: 2021-06-07 07:48:20
Installed via WooCommerce onboarding wizard: false

Despite all this (MailPoet as service provider setup) the hoster (webgo) claims that emails are still send via their servers – which of course would have a limitation of 50 mails/hr. Still that wouldn’t explain why the rate would be even below 50, yet it would fit to the a.m. limit of 25 mails every 5 mins. Questions are:

• What happend to the other 140 mails?
• How can we check, who really deals with the outgoing mails?
• Is the legacy subscription plan responsible for these limits?
• Do we have to signup for a new (free would be enough) plan?

thanks for any guidance

Stefan Kremer