How can I reduce the size of an email to avoid error 552?

Several methods can help: 1) Compress attachments (zip files). 2) Reduce image resolution before attaching. 3) Use file-sharing services like OneDrive, Google Drive, or Dropbox and include a link in the email instead of the attachment. 4) Remove unnecessary attachments or content. 5) Convert documents to PDF format, which often results in smaller file sizes.