The condition about "significant volumes" is not true.
Google states that the new requirements are mandatory only when you send at least 5000 messages per day.
This is a lie. I send at most a few messages per day and usually less than one per day was towards a gmail account and I had implemented a part of the requirements, but not all of them.
Nevertheless, Google has started to reject my messages, so I was forced to waste time with the implementation of all requirements, even if they are somewhat redundant.
Google states that the new requirements are mandatory only when you send at least 5000 messages per day.
This is a lie. I send at most a few messages per day and usually less than one per day was towards a gmail account and I had implemented a part of the requirements, but not all of them.
Nevertheless, Google has started to reject my messages, so I was forced to waste time with the implementation of all requirements, even if they are somewhat redundant.