不知為何，公司的 Mail 我架起來就是怪怪的...^^"
信無法寄給自己，我看了一下 maillog ，再去找問題
在網路上找到這篇
http://sendmail.org/faq/section4.html#4.5
Subject: Q4.5 -- How can I solve "MX list for hostname points back to hostname" and "config error: mail loops back to myself" messages?
Date: January 17, 1997
Updated: May 8, 2000
Updated: January 24, 2002
I'm getting these error messages:
553 MX list for domain.net points back to relay.domain.net
554... Local configuration error
How can I solve this problem?
You have asked mail to a domain (e.g., domain.net) to be forwarded to a specific host (in this case, relay.domain.net) by using an MX record, but the relay machine doesn't recognize itself as domain.net. Add domain.net to /etc/mail/local-host-names [known as /etc/sendmail.cw prior to version 8.10] (if you are using FEATURE(`use_cw_file')) or add "Cw domain.net" to your configuration file.
There are a couple of additional cases where you don't actually want local delivery, and thus adding domain.net to class w is not the right fix:
* When relay.domain.net should just be acting as a forwarder, e.g. a firewall/gateway box. The proper fix could be to set up a mailertable entry for domain.net.
* When relay.domain.net is a secondary (etc.) MX, and the MX mistakenly points to a CNAME or other "non-canonical" name [this gives "config error: mail loops back to me (MX problem?)"]. The proper fix is to point the MX at the actual name, a "work-around" to add the MX target to class w.
IMPORTANT: When making changes to your configuration file, be sure you kill and restart the sendmail daemon (for any change in the configuration, not just this one):
kill -HUP `head -1 /var/run/sendmail.pid`
神奇的是，我執行以上這個指令後，自己就能收到了...
Note: You can also get this error message (MX loops ...) when two sendmail systems talk to each other, and both have the same value of $j . The best solution is "don't do that."
信無法寄給自己，我看了一下 maillog ，再去找問題
在網路上找到這篇
http://sendmail.org/faq/section4.html#4.5
Subject: Q4.5 -- How can I solve "MX list for hostname points back to hostname" and "config error: mail loops back to myself" messages?
Date: January 17, 1997
Updated: May 8, 2000
Updated: January 24, 2002
I'm getting these error messages:
553 MX list for domain.net points back to relay.domain.net
554
How can I solve this problem?
You have asked mail to a domain (e.g., domain.net) to be forwarded to a specific host (in this case, relay.domain.net) by using an MX record, but the relay machine doesn't recognize itself as domain.net. Add domain.net to /etc/mail/local-host-names [known as /etc/sendmail.cw prior to version 8.10] (if you are using FEATURE(`use_cw_file')) or add "Cw domain.net" to your configuration file.
There are a couple of additional cases where you don't actually want local delivery, and thus adding domain.net to class w is not the right fix:
* When relay.domain.net should just be acting as a forwarder, e.g. a firewall/gateway box. The proper fix could be to set up a mailertable entry for domain.net.
* When relay.domain.net is a secondary (etc.) MX, and the MX mistakenly points to a CNAME or other "non-canonical" name [this gives "config error: mail loops back to me (MX problem?)"]. The proper fix is to point the MX at the actual name, a "work-around" to add the MX target to class w.
IMPORTANT: When making changes to your configuration file, be sure you kill and restart the sendmail daemon (for any change in the configuration, not just this one):
kill -HUP `head -1 /var/run/sendmail.pid`
神奇的是，我執行以上這個指令後，自己就能收到了...
Note: You can also get this error message (MX loops ...) when two sendmail systems talk to each other, and both have the same value of $j . The best solution is "don't do that."
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