You can see what kinds of properties you can see for media - I fed the URL of a video into embed.ly as that document suggested, but none of the fields returned gave me a video length... You may want to try with one of the images posted to your sub and see what properties you get. Maybe there's something else in the metadata you can search for that is common across the short videos. Source: 7 months ago

Some people report success with getting approved by https://embed.ly/, others report that service never responded to them. Source: about 1 year ago

Embed.ly — Provides APIs for embedding media in a webpage, responsive image scaling, extracting elements from a webpage. Free for up to 5,000 URLs/month at 15 requests/second. - Source: dev.to / over 1 year ago

Use https://embed.ly to extract the MEDIA_AUTHoR or MEDIA_AUTHOR_URL from the link and add it to either of the 2 rules below. Source: over 1 year ago

If you pull up that script, it references "cdn.embedly.com", a third-party content delivery network. See their home page at https://embed.ly/. Source: about 2 years ago

You should check to see if the messages that are being sent contain any links that would be considered questionable/spammy. You can also try taking the content of one of the messages and checking it’s spam assassin score ( https://spamcheck.postmarkapp.com ). Source: over 2 years ago

Build a clean email that passes a spam check with flying colors (https://spamcheck.postmarkapp.com/) then use a warmup service like lemwarm, inboxally or neverspam as mentioned in the other comments. Source: almost 3 years ago

The issue sounds more email centric. You're likely hitting the Apache SpamAssassin limit on the remote email servers. Use https://spamcheck.postmarkapp.com/ to check the score of emails you've had declared spam, and follow recommendations to improve. Source: about 3 years ago