We apologize for the instability of composr.app and appreciate your patience. We are working on the statistics addon and trying to find an optimal way to store and render data. Unfortunately, we have yet to find a solution that can handle the traffic (and therefore, tens of millions of statistical records) of composr.app. We're working hard on one.
Server issues: Your server might be on a spam blacklist, or there may be problems with your server's reverse DNS or HELO settings.
Content issues: Your email content might trigger spam filters due to factors like an unreasonable image-to-text ratio, broken reply-to addresses, or inconsistent text and HTML versions.
SPF records: Your "Website email address" might be hosted on a different server with an SPF record that doesn't authorize your web server to send emails from that address.
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