system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:What is the point of spam e-mails that don't have any links/advertisements, but rather just have nonsensical gibberish? How are scammers making money off these?
gpt
They can be used to check for valid email accounts or accounts that people actually use so that they can be further spammed.

If it's an invalid email account, it will be bounced by the mail server.

They can receive a "read" receipt by the reader. This allows the spammer to see that the someone is using that account. This is less common because you typically have to specify that you want to send a "read" receipt.

Others have an embedded image (as small as a small white dot) to a website that can track how many times it was viewed and from where. This is why many email programs initially block linked web images.

EDIT: I'll add some more points that others have mentioned:

The gibberish can be used to disarm spam detection methods. If enough gibberish goes through, a spam account can be marked as not-spam or the spam filter will not care about a certain order of words.

Combined with the other read detection abilities, spammers can see what type of emails will get past the spam filters. This is a way of reverse engineering the spam detection rules.