I use those images with great success. I have 2 bedrock and a Java edition with Forge on it with great success.

Could it be a size thing? Were these all large images?

THIS!

Managing mail servers is the worst. If you want your own email just go register email on something like Zoho. It’s cheap and the couple $$ you spend on it is money well spent to prevent the time and aggravation you’ll have running your own server.