Email Size Limit

I was wondering if there was an email size limit, and if so, is there a way for me to change it?

I was experiencing an issue with emails that had large images in them. I had two large emails, one being 9MB and the other being 6MB. My third largest email was 1MB and that was able to through smoothly. So I’m guessing there’s a limit in between 1-6MB?

I had to download Thunderbird and use IMAP to see what was in the mail queue. (The message must have been so large that I couldn’t use RoundCube WebMail to check it.) I was able to workaround the issue by copying the plain text and then inserting the images into the post.

Thanks in advance!