Start with these checks before opening a ticket:

• Can you log in to webmail with the same mailbox and password?
• Is only one device affected, or all devices?
• Does receiving fail, sending fail, or both?
• Did DNS or Cloudflare settings change recently?
• Is there a bounce message? If yes, include the full bounce text.

For faster support, include the sender, recipient, approximate time, and exact error message.