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What are built-in X-Headers?

April 26, 2017built-in

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What are built-in X-Headers?

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Each generated message, generated by OstroSoft SMTP Component, contains X-Mailer header with application name and license type (for example: X-Mailer: OstroSoft SMTP Component (Non-commercial license)). Non-commercial license of OstroSoft SMTP Component also inserts X-Warning header, stating the following: “X-Warning: Using of this component for unlawful activities is STRICTLY PROHIBITED.