DNS updated but emails not working

Hey Janik please can you help me. I know that the system webt down, but i have been struggling to get my emails to work again. The DNS propogation eventually came back ane i managed to get that sorted over the weekend. However i still have R2 bucket issues and emails. When i activate cloudflare on my site i get email delivery issues, can send emails, but cannot recieve emails. Some help would be appreciated as we run a web and hosting company. Thank you

Tim