iBLJa1Gu008596: .. did not issue MAIL/EXPN/VRFY/ETRN during
connection to MTA
Oliver Hookins
ohookins at GMAIL.COM
Tue Dec 21 23:22:13 GMT 2004
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Peter Bonivart wrote:
> Peter Bonivart wrote:
>
>> Ping does not connect to 53/tcp, it's a completely different mechanism.
>
>
> Sorry for replying to my own post but I for some reason wrote 53 (DNS)
> when I of course meant 25 (SMTP). Sorry for the confusion.
>
> --
> /Peter Bonivart
Ping doesn't connect to port 25 either. It's a different protocol
altogether. Ping uses ICMP whereas SMTP uses TCP. DNS most often uses
UDP. Ping can't be altogether relied on to determine connectivity with a
host as it might be blocking ICMP traffic.
Regards,
Oliver
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