Mailster automates bounce processing with proper setup. Assign a dedicated bounce address, enter server credentials, and define bounce check options. Soft bounces are retried while hard bounces result in immediate subscriber removal. Regularly test your settings to ensure functionality and maintain a clear postbox.
To automatically manage bounces in Mailster using SendGrid, install the SendGrid Integration plugin. Choose SendGrid on the delivery tab to mark future bounces automatically. For Mailster, request SendGrid Support to enable the “preserve headers” option; otherwise, it will overwrite your return-path. Note that the WEB API is incompatible with Mailster’s bounce handling.
To set up a bounce server, use port 110 or 995 for SSL connections. If you encounter an “Unable to connect” error, your host may be blocking the port. Check the open ports in the Settings => Newsletter => System Info Page for troubleshooting.