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Operating Systems BSD sendmail on FreeBSD
# 1  
Old 01-24-2006
sendmail on FreeBSD
Dear all,

I have been using freebsd 5.4 for 2 months using fetchmail to retrieve mails and using sendmail to send mails.
I have no problem with fetchmail to retrieve mails from pop3 server.
And most of the time I have no problem with sendmail.
But recently I found that I could not send mails to freebsd-stable@freebsd.org.
Actually sendmail is a mail server (not a client), which sends mails directly from my host to other mail servers without relaying and SMTP is a server-to-server protocol, which requires reverse DNS to gain full functionality.
Correct me, if I'm wrong.
I found that rDNS was not supported to the given IP address and PTR record was not found (I don't know so much about them).
So my sendmail can not work with some destination servers.
How to config rDNS? Shall I call ISP?
Does relay help me solve this problem? And how to config it?

More info: I'm on dual stack; dynamic IPv4 and static IPv6 (6bone).
Somebody who experienced this problem please point me out.

Thanks in advance,
Jaguar
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LEARN ABOUT DEBIAN

sendmailconfig

SENDMAILCONFIG(8)					      System Manager's Manual						 SENDMAILCONFIG(8)

NAME

       sendmailconfig - configure sendmail for Debian systems

SYNOPSIS

       sendmailconfig [--no-reload]

DESCRIPTION

       sendmailconfig is used to simplify the configuration of sendmail(8) for use on Debian systems.

       In  the	simplest  case,  you  may  run	this program to (re)configure sendmail for your Debian system at any time. It will modify the file
       /etc/mail/sendmail.mc in order to create a working sendmail configuration which will be written to the file /etc/mail/sendmail.cf.

       For advanced configurations, you can modify the sendmail.mc file before generating sendmail.cf. Future invokations of  sendmailconfig  will
       preserve these changes provided they are made at the end of the file.

       Normally  sendmailconfig  will  ask  if	you want to reload sendmail after making changes to its configuration. The --no-reload option will
       avoid this question.

FILES

       /etc/mail/sendmail.mc
	      sendmail m4 input to generate sendmail.cf

       /etc/mail/sendmail.cf
	      actual sendmail configuration file

       /etc/mail/sendmail.cw
	      names for which we will accept mail in the standard configuration

       /etc/mail/sendmail.ct
	      names of trusted users in the standard configuration

SEE ALSO

       sendmail(8)

AUTHOR

       Robert Leslie <rob@mars.org>

								    21-Jan-1997 						 SENDMAILCONFIG(8)