Zbigniew Szalbot wrote: >> >> The "!A" means Administrative Prohibition; more precisely, ICMP 3, >> "Destination Unreachable", Code 11, "Destination Network Unreachable for >> Type of Service". >> >> Either regular traceroute was used, or tcptraceroute on a port which >> isn't open on a firewall / border ACL / whatever. > > man tcptraceroute gives me the option to specify source port / host / > destination port. Which port would you advise to use? >
The port you are using for SMTP, so 25. I missed the !A in the last line (never be too prompt to answer :)). >From your traces, it seems (but I may be wrong), that icmp is not routed the same way as tcp (at least on port 25). You should probably try to contact opentransit (from whois: [EMAIL PROTECTED]) to ask why they are blocking your SMTP traffic.
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