Mailinglist Archive: opensuse-security (465 mails)

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Re: [suse-security] sendmail
  • From: Stefan Suurmeijer <stefan@xxxxxxxxxxxx>
  • Date: Wed, 26 Dec 2001 14:53:46 +0100
  • Message-id: <3C29D66A.3090902@xxxxxxxxxxxx>
1) Make sure that your domain MX records are working (use dig MX or nslookup -type=MX The name(s) returned should be the real internet names/addresses of your mailserver, not CNAMES as mentioned
2) If those records are correct, try telnetting to your mailserver to find out what is wrong there: telnet my.mailserver.address 25
you will get a helo prompt: type: helo your.workstation.address
the mailserver will greet you nicely (;-))
type: mail from: email@xxxxxxxxxxxxxxx
the server should accept the sender name
type: rcpt to: someadress@xxxxxxxxxxxxxx
The server should accept this address as a valid delivery address (please make sure it's an existing address in your domain). If it doesn't, it'll give an error message that should give you some clue as to what is going wrong.
Most likely your domain/server address isn't setup right in your, or you might have a firewall blocking access (if you nmap from inside your own domain the ports may seem open, but they might not be accessible from the outside
3) Ignore gratuitous comments from others about mailservers that are "bigger, better, faster", etc etc etc. People will never agree on which one is best anyway.



rhelms@xxxxxxx wrote:


To mine knowledge, CNAME isn't allow for a mailserver ..

the short version - the entry in your DNS is MX ... for
your mailserver.

For more security with your mailserver I suggest you
to change to qmail ( and use the
tcpservermethod. With qmail you haven't the getroot-problems
of sendmail because it uses different mailusers.


E-Mail: rhelms@xxxxxxx
Date: 26-Dec-2001
Time: 10:35:49

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Stefan Suurmeijer University of Groningen, Rekencentrum
P.O. Box 800, NL-9700 AV Groningen, The Netherlands
tel: (+31) 50 363 8258 - fax: (+31) 50 363 3406
E-mail: S.M.Suurmeijer@xxxxxxxxx
E-mail: stefan@xxxxxxxxxxxx (private)

Quies custodiet ipsos custodes? (Who'll watch the watchmen?)

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