De mailserver van UPC mag simpelweg geen e-mails accepteren bestemd voor domeinen anders dan upcmail.nl, chello.nl e.d.,
tenzij je op het UPC-netwerk zit. Dit is puur ter voorkoming van misbruik. Ik heb het zonet getest: vanaf een niet-UPC verbinding kan ik alleen mailen naar upcmail.nl (en waarschijnlijk chello.nl)...
PC2 - UPC-verbinding
sylvesterrr@pc2:~$ telnet mail.upcmail.nl smtp
Trying 213.46.255.2...
Connected to mail.upcmail.nl.
Escape character is '^]'.
220 edge02.upc.biz edge ESMTP server ready
HELO hotmail.com
250 edge02.upc.biz hello [xxx.xxx.xxx.xxx], pleased to meet you
MAIL FROM:
[email protected]
250 2.1.0 <
[email protected]> sender ok
RCPT TO: [email protected]
250 2.1.5 <[email protected]> recipient ok
QUIT
221 2.0.0 edge02.upc.biz edge closing connection
Connection closed by foreign host.
sylvesterrr@pc2:~$
PC1 - andere provider
sylvesterrr@pc1:~$ telnet smtp.upcmail.nl smtp
Trying 213.46.255.2...
Connected to mail.upcmail.nl.
Escape character is '^]'.
220 edge04.upc.biz edge ESMTP server ready
HELO hotmail.com
250 edge04.upc.biz hello [xxx.xxx.xxx.xxx], pleased to meet you
MAIL FROM:
[email protected]
250 2.1.0 <
[email protected]> sender ok
RCPT TO: [email protected]
550 5.1.1 <[email protected]> relaying denied
quit
221 2.0.0 edge04.upc.biz edge closing connection
Connection closed by foreign host.
sylvesterrr@pc1:~$ telnet smtp.upcmail.nl smtp
Trying 213.46.255.2...
Connected to mail.upcmail.nl.
Escape character is '^]'.
220 edge03.upc.biz edge ESMTP server ready
HELO hotmail.com
250 edge03.upc.biz hello [xxx.xxx.xxx.xxx], pleased to meet you
MAIL FROM:
[email protected]
250 2.1.0 <
[email protected]> sender ok
RCPT TO:
[email protected]
550 5.1.1 <
[email protected]> recipient rejected
RCPT TO: [email protected]
250 2.1.5 <[email protected]> recipient ok
quit
221 2.0.0 edge03.upc.biz edge closing connection
Connection closed by foreign host.
sylvesterrr@pc1:~$