Internal bounces and managing them

When sending email campaigns, it is common to encounter something known as the "Internal" bounce type. You can see this by generating a bounce report. The report contains the timing, the email, and the message relating to that internal bounce. The message itself is pretty descriptive, which helps identify the issue, but sometimes they are not all that straightforward.

Internal bounces occur for many reasons, such as timed out connections between two email servers, exceeding certain thresholds set on one or more servers, denial of relay access, blocked accounts etc. They are treated a little different to hard bounces by MailWizz. Generally, the internal bounces don't indicate a permanent problem. It usually resolves during the next retry or next scheduling of your campaign. The best way to approach these types of bounce is to go through them by combining similar ones into each pile and addressing those issues detailed by the message captured during communication.

MailWizz does not take any action against internal bounces, so you must make sure you look into them yourself. It could be due to a whole host of issues ranging from lousy networks to prolonged networks or a combination of them. It is best to go through them and address them manually.