> -----Original Message-----
> From: centos-bounces@xxxxxxxxxx
> [mailto:centos-bounces@xxxxxxxxxx] On Behalf Of Alexander Dalloz
> Sent: Wednesday, April 12, 2006 7:06 AM
> To: CentOS mailing list
> Subject: RE: 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@xxxxxxxxxxx>
> > (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@xxxxxxxxxxxxxxxxxxxxx> 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.
>
> Alexander
Hello Alexander,
Yes, I have a dynamic IP address. If I use my ISPs mail host as the
SMART_HOST, would that cause relaying problems? I tried that on the mail
client end a while back and got errors about relaying.
Thanks, I'll give it a try.
Eddie
