Ensure Multi-Factor Authentication is active for all authentication flows, including basic authentication.
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If the target’s MX rejects your connection, you can relay through a known open SMTP server: such as Windows Security
: Many antivirus programs flag mail checkers as "riskware" or "potentially unwanted programs" (PUPs) due to their nature. You may need to create an exception in your security suite, such as Windows Security , though this should be done with caution. Installation and Configuration Steps hackus mail checker install