sendmail question

Hi,
I use sendmail to send automatic emails from servers to my mailbox, to get
information about disk status, etc. Now it seems as several mail providers
are stopping incoming mails from machines not registered as mail machines. Is
there a way to avoid this? I understand that this way of blocking is to
prevent spammers, but it is quite bothering if you want to use sendmail for
"fair" uses.

Thanks,
Luca

--
Luca Ferrari,
fluca1978@virgilio.it
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Re: sendmail question

Depending on your setup, if machines don't like mail coming from a dialup
or dynamic ADSL connection I have set up sendmail to use my ISP as a smart
relay. That way, mail comes from an authentic/well known provider. One
more hop, but it should do the trick.

On Wed, 26 May 2004 17:48:16 +0200, Luca Ferrari
wrote:

> Hi,
> I use sendmail to send automatic emails from servers to my mailbox, to
> get
> information about disk status, etc. Now it seems as several mail
> providers
> are stopping incoming mails from machines not registered as mail
> machines. Is
> there a way to avoid this? I understand that this way of blocking is to
> prevent spammers, but it is quite bothering if you want to use sendmail
> for
> "fair" uses.
>
> Thanks,
> Luca
>



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| Richard Nairn Specializing in Linux
| Nairn Consulting Web / Database Solutions
| Calgary, AB
| Richard@NairnConsulting.ca
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Re: sendmail question

On Wed, May 26, 2004 at 05:48:16PM +0200, Luca Ferrari wrote:
> Hi,
> I use sendmail to send automatic emails from servers to my mailbox, to get
> information about disk status, etc. Now it seems as several mail providers
> are stopping incoming mails from machines not registered as mail machines. Is
> there a way to avoid this? I understand that this way of blocking is to
> prevent spammers, but it is quite bothering if you want to use sendmail for
> "fair" uses.

Many mail servers require sender to be registered in "reverse DNS".
Look:

web@dimss:~$ host gw
gw.solutions.lv has address 159.148.92.164
web@dimss:~$ host 159.148.92.164
164.92.148.159.in-addr.arpa is an alias for 164.nite.lv.92.148.159.in-addr.arpa.
164.nite.lv.92.148.159.in-addr.arpa domain name pointer gw.solutions.lv.
web@dimss:~$

Here 159.148.92.164 is mapped to gw.solutions.lv in "reverse zone".
Ask your provider to add record like this for your IP-address.

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Re: sendmail question

Most all isp's and companies are configuring their mail servers to
reject email from servers that do not have a properly configured
reverse dns entry. One solution would be to have your servers
configured to use a smart relay, and this relay machine has a properly
configured dns for reverse dns lookups and of course this relay will
allow you to relay through it. You may decide to manage your own dns,
if so just have your isp insert entries into their dns namespace that
says you (your ip block) is responsible for managing the dns records
and then all such queries will be directed to your name servers.

I noticed many servers requiring reverse-dns about 6 months ago
due to the incredible spam problem.

Hope that helps.


* On [05-26-2004 17:48 +0200] Luca Ferrari wrote:
> Hi,
> I use sendmail to send automatic emails from servers to my mailbox, to get
> information about disk status, etc. Now it seems as several mail providers
> are stopping incoming mails from machines not registered as mail machines. Is
> there a way to avoid this? I understand that this way of blocking is to
> prevent spammers, but it is quite bothering if you want to use sendmail for
> "fair" uses.
>
> Thanks,
> Luca
>

--
Jeffrey Morse CCNA, MCP, SCJP
jmorse@m4cc.com
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