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While invalid email addresses are a significant factor for high bounce rates, they're not the only culprit. If your email bounce rate is still high after your email list cleaning is complete, many different factors may be at play. These variables are unrelated to whether or not the email address is valid or invalid.
Here are some examples of what can cause a high email bounce rate:
All of these examples can cause your emails to bounce even if the email address is "valid."
To understand what's causing a bounce, you'll need to access your Simple Mail Transfer Protocol (SMTP) logs and analyze the associated SMTP bounce codes. These are generally three-digit codes that have a universal meaning regardless of your email delivery service. Different mail service providers often have their own custom response codes, so be sure to investigate yours with your provider.
If you continue to experience a high email bounce rate, and it's not a result of one of the examples above, ZeroBounce will assist.
Reach out to the support team at support@zerobounce.net. Attach the bounced email in question along with the corresponding SMTP bounce code. The team will be happy to investigate any unexpected bounces as part of the company's accuracy guarantee.
For additional assistance with overcoming email deliverability issues, ZeroBounce put together The Complete Email Deliverability Guide, along with help from email marketing experts around the industry. The content covers how to navigate and troubleshoot common email delivery problems as well as best practices for your company to use moving forward.
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