There are many reasons for email bounces, and a cleaning list only assures if the email addresses are valid or invalid. There can be other factors as well which cause the email bounce.

  • Have exceeded the email sending limit set by your email service provider.
  • The particular recipient has blocked you.
  • Email server IP is temporarily or permanently blocked by the recipient domain mail server.
  • The email content is inappropriate and being marked as spam by some recipient domains.
  • Email server domain/IP is blacklisted.

Inspect the SMTP logs of the email service to identify the exact reason for the email bounce. 

In case you experienced a high bounce rate and checked that it is not because of any above reasons, we can investigate the particular bounce back. 

Send the complete bounce back an email with a header at The team will check if there is an issue with list cleaning.