Analizar cabeceras y configuraciones de correo
Análsis de cabeceras
- https://www.ip2location.com/free/email-tracer
- https://mxtoolbox.com/Public/Tools/EmailHeaders.aspx
- https://toolbox.googleapps.com/apps/messageheader/analyzeheader
Validar DMARC
- https://easydmarc.com/tools/dmarc