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Monday, April 15, 2013

550 5.7.1 Relaying denied. IP name lookup failed

Recently we configured a BigIP virtual for SMTP called

Whenever I tried sending mail through this it would complain:

# telnet 25


Connected to
Escape character is '^]'.

220 ESMTP Sendmail 8.13.8/8.13.8; Mon, 15 Apr 2013 22:34:54 -0400


250 2.1.0 Sender ok


550 5.7.1 Relaying denied. IP name lookup failed []

Doing an nslookup on this name failed.  If I did it would go to the BigIP user interface.  This IP address was somewhere related to the BigIP device, and did not have a hostname in DNS.  I have sent a mail to the network team for further investigation about this IP.

The usual practice for allowing relay from certain hosts is to add those hosts to /etc/mail/local-host-names.  However since this IP was not present in DNS, I added the following line to /etc/mail/access on all smtp nodes :

Connect:             RELAY

and bounced sendmail on Linux

/etc/init.d/sendmail restart

The Relaying Denied is not coming anymore.

1 comment:

ORACLE DBA video and text on LINUX said...

sorry for asking questions irrespective of this post

could you tell me the background process (in apps and db) when we login to fron end using which config files it uses and flow?