[CentOS] Sendmail problem

Thomas E Dukes edukes at alltel.net
Wed Apr 12 11:23:37 UTC 2006


 

> -----Original Message-----
> From: centos-bounces at centos.org 
> [mailto:centos-bounces at centos.org] On Behalf Of Alexander Dalloz
> Sent: Wednesday, April 12, 2006 7:06 AM
> To: CentOS mailing list
> Subject: RE: [CentOS] Sendmail problem
> 
> Am Mi, den 12.04.2006 schrieb Thomas E Dukes um 2:23:
> 
> > Here'sanother bounce email:
> > 
> > The original message was received at Tue, 11 Apr 2006 
> 19:16:44 -0400 
> > from localhost.localdomain [127.0.0.1]
> > 
> >    ----- The following addresses had permanent fatal errors ----- 
> > <xxxxxx at comcast.net>
> >     (reason: 521-EHLO/HELO from sender 71.31.91.127 does not map to 
> > localhost.localdomain in DNS)
> > 
> >    ----- Transcript of session follows ----- ... while talking to
> > gateway-s.comcast.net.:
> > >>> MAIL From:<apache at localhost.localdomain> SIZE=2176
> > <<< 521-EHLO/HELO from sender 71.31.91.127 does not map to 
> > localhost.localdomain in DNS <<< 521-sending machine name must be 
> > provided as a fully <<< 521-qualified domain via EHLO/HELO command.
> > <<< 521-see section 4.1.1.1 and 4.1.4 of RFC 2821 <<< 521 
> 521: Comcast 
> > requires that all mail servers must have a PTR record with a valid 
> > Reverse DNS entry. Currently your mailserver does not fill that 
> > requirement. For more information, refer to:
> > http://www.comcast.net/help/faq/index.jsp?faq=Email118405
> > 554 5.0.0 Service unavailable
> 
> 2 things:
> 
> 1) Your mail host at that time of the mail had the hostname 
> localhost.localdomain, thus your Sendmail used it for 
> EHLO/HELO. You fixed that meanwhile
> 
> 2) The remote side requires not only a valid forward DNS 
> record (palmettodomains.com points to that IP) but too a 
> matching reverse one.
> From here I can't judge whether the named IP is static and 
> thus assigned by your ISP. If that is the case then you 
> really should take care for both types of DNS entries. If not 
> (you are on an dynamic line) you should use your ISP's mail 
> host as SMART_HOST within your Sendmail configuration. DynDNS 
> is a very bad base for reliable mail services.
> 
One thing I should mention is that I use MailScanner.  Don't know if that is
part of the problem but when installed, sendmail service is turned off but I
think is controlled by MailScanner.





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