Re: 'Name server failure' is output

2 msg	postmap header_checks error
10 msg	mailbox_command (dovecot lda) stopped working, ...
5 msg	mynetworks via LDAP lookup
7 msg	Local recipient table in LDAP problem
2 msg	proxy_read_maps
1 msg	smtpd_restriction_class and it's lookup
8 msg	Message Rejected
12 msg	Customize to filter attachment ?
2 msg	Relay question
14 msg	unnecessary routing?
4 msg	do not use 'reject_maps_rbl'?
9 msg	Fwd: Postfix in OpenVZ.
2 msg	bypass body_checks for local mail?
4 msg	catchall with relay_recipient_maps

'Name server failure' is output
\ Yuichi Shirakawa (23 Jan 2008)
. \ mouss (23 Jan 2008)
. . \ Yuichi Shirakawa (4 Feb 2008)
. . . \ mouss (5 Feb 2008)

3 msg	smtp_sasl_password_maps lookups
16 msg	Postfix Queues on a Ram Disk
15 msg	sendmail compared to smtp sending
3 msg	Postfix does not recognize remote emails
2 msg	How to disable SSLv2 on smtpd opportunistic TLS?

Subject:	Re: 'Name server failure' is output
Group:	Postfix-users
From:	mouss
Date:	23 Jan 2008

Yuichi Shirakawa wrote:
> Hi,
>
> A following message was output on my postfix server.
>
> --------
> Dec 5 03:50:01 testsrv postfix/smtpd[23533]: warning: mmm.nnn.ooo.ppp:
> hostname ppp.ooo.nnn.mmm.in-addr.arpa verification failed: Name server
> failure
> --------
> # mmm.nnn.ooo.ppp is IP address.
>
> Please tell me whether a corresponding E-mail is rejected.
>

no. it's just a warning in case you need to track misconfigured hosts or
DNS problems.
> If the E-mail is rejected, do it retry until the one can be sent?

other log lines should show whether the message is accepted or rejected
(by some rules).