[GLLUG] Sendmail configuration

[Richard Houser]

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I've got the same problem with Moronic mail admins that blindly reject
IP blocks like that.  It's a pain, but I've resolved to email the first
users from each such domain I find and then blindly forward all future
email to that destination off to an ISP that doesn't properly handle
mail (i.e. Comcast).

Deepan,

I'd consider getting a real domain anyhow.  You can get one for as
little as $7-10 yearly and can use it for other things like pointing
back to your machines, etc.

Lachniet, Mark wrote:
| Mike's right about having proper looking headers.  I'd add to that - if
| you only intend to *send* e-mails to real people and real mail servers
| on the Internet, you'll probably get by with using your ISP's smart host.
|
| However, if you want to receive them as well, you'll probably also want
| to get a proper DNS name such as mail.deepan.com, and make sure that you
| also have *reverse* DNS records so that if some does a DNS lookup on
| your IP address, it will come up with mail.deepan.com as well.  If you
| don't do that, a lot of mail servers on the Internet will reject your
| mail outright. In addition to DNS you'll want to change your servers
| hostname to mail.deepan.com, and also edit your mail config with that
| information as well.  If you are going to receive mail on that host,
| make sure you check your mail relaying configuration so that not "just
| anybody" can send mail through you, or you'll get blacklisted in a week
| or so.
|
| Even then you won't get everyone.  Some ISP's appear to block any mail
| that clearly comes from a DSL or Cable modem IP range (hence another
| reason to use your ISP's smart host)  I run a full time mail server from
| my ACD DSL account (lachniet.com) and its a real pain some times.  For
| example, SBC Ameritech apparently outright blocks my whole IP range
| randomly, which has forced my mom to get a gmail account.  Tis annoying
|
| Mark Lachniet
| Solutions Architect - Security
| Analysts International
| 3101 Technology Blvd. Suite A
| Lansing, MI 48910
| (517) 336-1004 (voice)
| mailto:mlachniet at analysts.com
|
|
| ------------------------------------------------------------------------
| *From:* linux-user-bounces at egr.msu.edu on behalf of Mike Rambo
| *Sent:* Thu 3/20/2008 7:16 AM
| *To:* Deepan
| *Cc:* linux-user at egr.msu.edu
| *Subject:* Re: [GLLUG] Sendmail configuration
|
| Deepan wrote:
|  > Hi All,
|  > I am using sendmail via php mail function to send
|  > emails. However few servers reject my mails with
|  > the error 'Sender address rejected: Domain not
|  > found', since mails from my server are sent as
|  > email at localhost.localdomain. How do I change this
|  > to a valid domain name ? We only own a public IP.
|  > we dont really have a domain name, is it possible
|  > to use IP ?
|  > Regards
|  > Deepan
|
| You need to set up sendmail to masquerade as a real domain, like that of
| your ISP for example, use your ISP as a smart host to send the mail, and
| set up the genericstable feature of sendmail so it will modifiy the mail
| headers to make mail sent by apache (or whatever user your php scripts
| will appear to run as and thus mail as) to be rewritten to a valid user
| from your ISPs perspective. Or at least, those three steps are what I
| have done when I need to do such things. I've got about five or six
| servers set up to do basically what you're describing and It Works For
| Me. That said, I've not spent a great deal of time to see if there is an
| easier way and I certainly don't claim to comprehend all of sendmail.
YMMV.
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|
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