This is just an update that I can share with you. After GDPR changes gmail seems to block messages more often based on their body content. Same goes for Yahoo & AOL. We're talking for >150% chance for temporary blocks based on body/subject. No changes in way of behavior are detected by other big or small email providers but the mentioned ones are taking a huge piece from the pie in email marketing and worth to mention.
Our statistics are based on millions of emails so it is truthful.
Do you noticed the same? Are you prepared and does anybody has tips for the new anti-spam tricks that should be considered?