Unable to send email to a specific domain. For example in my case is yahoo.co.jp.

[gandhi.rifal]

Hi,

Please help,

I have a problem that unable to send email to yahoo.co.jp.

I try telnet with port 25 to mx yahoo.co.jp, but host is unreachable. But I can ping to yahoo.co.jp.

I have check on mxtoolboxs.com, but my ip is good.

Any solution with this problem?

Thanks,

Gandhi

[Stephan Bayer]

Hi Gandhi,

It sounds like there may be a DNS resolution issue on your network. To confirm whether your device can find the MX records for the domain, follow the steps below.

Welcome to the Cisco IronPort X1070 Messaging Gateway(tm) Appliance

ironport> nslookup

Please enter the host or IP address to resolve.

[]> yahoo.co.jp

Choose the query type:

1. A       the host's IP address

2. AAAA    the host's IPv6 address

3. CNAME   the canonical name for an alias

4. MX      the mail exchanger

5. NS      the name server for the named zone

6. PTR     the hostname if the query is an Internet address,

otherwise the pointer to other information

7. SOA     the domain's "start-of-authority" information

8. TXT     the text information

[1]> 4

MX=mx1.mail.yahoo.co.jp PREF=10 TTL=30m

MX=mx2.mail.yahoo.co.jp PREF=10 TTL=30m

MX=mx3.mail.yahoo.co.jp PREF=10 TTL=30m

MX=mx5.mail.yahoo.co.jp PREF=10 TTL=30m

ironport>