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Re: [TEKNIK] SMTP, kan kun lave telnet til mit relæ . Hvorfor?



2009/9/11 David Bo Jensen <sslug@sslug>:
> Jeg har prøvet, at lave en telnet forbindelse til det relæ, der sender min
> post ud i den store vide verden. Det er tcp over port 25, og det fungerer
> fint.
> Nu tænkte jeg, at jeg kunne gøre det samme direkte til den server, som skal
> modtage min mail også med port 25. Det kan jeg imidlertid ikke. Hvorfor?
>

Man kunne forestille sig at du prøvede at forbinde direkte til
domæne.dk, når du skriver til sslug@sslug - men det gør du ikke.
Hvis du laver et DNS opslag på et domæne, indeholder det (ofte) en
række MX records, som viser hvor post skal sendes hen. Derfor kan mail
til domæne.dk godt skulle sendes til mailudbyder.dk.

Et opslag på google.com giver f.eks. det her:

google.com has address 74.125.67.100
google.com has address 74.125.127.100
google.com has address 74.125.45.100
google.com mail is handled by 10 google.com.s9a1.psmtp.com.
google.com mail is handled by 100 google.com.s9a2.psmtp.com.
google.com mail is handled by 10 smtp1.google.com.
google.com mail is handled by 10 smtp2.google.com.
google.com mail is handled by 10 smtp3.google.com.

Der kan man se at mail til google.com skal sendes igennem
smtp{1,2,3}.google.com.

--
Tue


 
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