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тАО12-08-2005 09:30 PM
тАО12-08-2005 09:30 PM
sendmail and HELO command
a question about sendmail.
I would like to do sendmail works with HELO command like the following: normally sendmail sends an HELO command with the hostname
HELO pippo.
or with FQDN
HELO pippo.pluto.com
Now I would like to send the HELO command with the IP address, e.g.
HELO 13.14.15.16
I would like that because this hostname is not recognized from any DNS and SMTP server doesn't recognize it as well. It is recognized by the IP address.
Surely a possible solution should be to solve it by DNS correctly but btw I would like to know if what I am asing is possible.
All replies will be appreciated.
Thanks and regards,
Fabio
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тАО12-08-2005 11:56 PM
тАО12-08-2005 11:56 PM
Re: sendmail and HELO command
Bill Hassell, sysadmin
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тАО12-09-2005 01:39 AM
тАО12-09-2005 01:39 AM
Re: sendmail and HELO command
this system doesn't use DNS, just /etc/hosts.
For that I have already configured /etc/nsswitch.conf to see only the files
hosts: files
but not sendmail.cw. I have just configured it now sendmail.cw contains
13.14.15.16
localhost
pluto
and then sendmail stop/start.... but it still fails searching for hostname
>>> EHLO pluto.
....
504
Service unavailable
Thx anyway Bill.
Other hints would be appreciated as well.
Regards,
Fabio
Thanks anyway
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тАО12-09-2005 02:46 AM
тАО12-09-2005 02:46 AM
Re: sendmail and HELO command
Rgds...Geoff
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тАО12-09-2005 02:51 AM
тАО12-09-2005 02:51 AM
Re: sendmail and HELO command
tried that....in /etc/hosts
13.14.15.16 pippo pippo.pluto.it
but it is failing yet with
Deferred: 450
In my previous post I wrote pluto like hostname..not consider it since the hostname is pippo, so s/pluto/pippo in my previous post.
Thanks anyway Geoff.
Other hints appreciated.
Regards,
Fabio
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тАО12-09-2005 03:08 AM
тАО12-09-2005 03:08 AM
Re: sendmail and HELO command
Set the DM macro to yourdomain.com in sendmail.cf:
DMpluto.com
Rgds...Geoff
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тАО12-09-2005 03:12 AM
тАО12-09-2005 03:12 AM
Re: sendmail and HELO command
As far as your question about using IP address instead of hostname for HELO or EHELO
is NOT possible.
Since Sendmail 8.1.7 as per RFC 1123 which stipulates 'HELO' and 'EHELO' commands are
followed by a fully qualified hostname.
The same is confirmed by the error 504 in your case.
There has to be aresolved host-name in FQDN form to make sendmail work. The resolution may be from /etc/hosts or DNS , but it has to be there.
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тАО12-19-2005 06:53 AM
тАО12-19-2005 06:53 AM
Re: sendmail and HELO command
If you can nslookup domain_name at the command prompt, then sendmail should be able to as well, and your problem would be solved.
The sendmail guys put in most of the HELO checks to minimize spam and hacking attempts, so the following advice circuments those controls, thus potentially opening you up to spam, hacks, and other bad behavior:
Try changing this line to
#O AllowBogusHELO=False
O AllowBogusHELO=True
in sendmail.cf. Restart sendmail.
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тАО09-03-2009 05:03 AM
тАО09-03-2009 05:03 AM