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+# Esquema Mail
+
+## Origen con Servidor Local
+
+```
+MUA origen --*SMTP*--> MTA local --> MDA local --> Buzón de enviados
+                                 \--> MTA receptor --> MDA receptor --> Buzón recibidos
+
+MUA receptor --*IMAP/POP*--> MTA receptor --> MDA receptor --> Buzón recibidos --> MDA receptor --> MTA receptor --*IMAP/POP*--> MUA receptor
+```
+
+```
+   Origen        Servidor Recipiente    Recipiente
+-------------       -------------     -------------
+| --------- |       | --------- |     | --------- |
+| |  MTA  | |       | |  MTA  | |     | |  MUA  | |
+| --------- |       | --------- |     | --------- |
+| |  MUA  | |       | |  MDA  | |     -------------
+| --------- |       | --------- |
+| |  MDA  | |       | | Buzón | |
+| --------- |       | --------- |
+| | Buzón | |       -------------
+| --------- |
+-------------
+```
+
+## Receptor con Servidor Local
+
+```
+Origen --*SMTP*--> MTA origen --> MDA origen --> Buzón de enviados
+                              \--> MTA receptor local --> MDA receptor local --> Buzón recibidos
+
+MUA receptor local --*IMAP/POP*--> MTA receptor local --> MDA receptor local --> Buzón recibidos --> MDA receptor local --> MTA receptor local --*IMAP/POP*--> MUA receptor local
+```
+
+```
+  Origen           Servidor Origen          Receptor
+-------------       -------------        -------------
+| --------- |       | --------- |        | --------- |
+| |  MUA  | |       | |  MTA  | |        | |  MTA  | |
+| --------- |       | --------- |        | --------- |
+-------------       | |  MDA  | |        | |  MUA  | |
+                    | --------- |        | --------- |
+                    | | Buzón | |        | |  MDA  | |
+                    | --------- |        | --------- |
+                    -------------        | | Buzón | |
+                                         | --------- |
+                                         -------------
+```