[svlug] Relay

[Derek J. Balling]

Unless RH has started doing some very wonky stuff, you'll have to 
build sendmail from source, as you'll need to compile with the SASL 
flags (for the authentication).

Don't be afraid of source. The source is GOOD. 'make' is GOOD. Not 
everything in Linux will come "out of a box ready to go", especially 
when you start asking for "oddities" like allowing remote relaying.

D


At 12:44 PM -0500 8/30/00, listalinux at ecotelmail.com wrote:
>Thank You, I saw that I have to upgrade to sendmail 8.11.
>
>I'm working with Red Hat 6.0 and there is a rpm in redhat website,
>but is maked as "CONTRIB", and I don't know if this will work well.
>
>Please anyone did and upgrade with rpm?
>
>Another question:
>I'm working with IMP and Emumail, if I start to use smtp auth ...
>this programs should work?
>
>Thank You.
>
>Geffrey.
>
>On 30 Aug 2000, at 9:54, Derek J. Balling wrote:
>
>>  Best bet is, since you need to be able to accept from anywhere in the
>>  world, is to disable relaying completely, upgrade to sendmail 8.10.X
>>  or 8.11.0 (8.11 preferred obviously) and use SMTP-AUTH.
>>
>>  When doing that, your user's mail client will connect to the mail
>>  server, and be told "I don't know you, authenticate."... the client
>>  will then issue a username and password which sendmail will then
>>  compare to some "known good" values (lots of different means of
>>  figuring that out).
>>
>>  You could (in theory) do some POP-before-SMTP hacking, but SMTP AUTH
>>  is the way to go (since most major mail clients support it now).
>>
>>  Be warned that relay-by-email is NOT secure, and its not hard (at
>>  all) to spam through you so long as you know one valid e-mail address
>>  on your server (hint "postmaster at ecotelmail.com" is probably a good
>>  one). (And most relay-by-email configurations don't even require the
>>  from address to be valid).
>>
>>  D
>>
>>
>>
>>
>>  At 11:23 AM -0500 8/30/00, listalinux at ecotelmail.com wrote:
>>  >Hi pals:
>>  >
>>  >Please, how can I configure sendmail, I don't want to have an open
>>  >relay. This is my problem:
>>  >
>>  >- I installed a mail server (Sendmail 8.9.3-10).
>>  >- The server have to accept mails from all users, but I can't
>>  >configure sendmail only for accept relays comming from my LAN,
>>  >the users could have any IP or hostname.
>>  >- The only way is accept relay only by email address, for example
>>  >users that have an account anyuser at ecotelmail.com should relay.
>>  >No by IP or Hostname.
>>  >
>>  >How can I do that with sendmail?
>>  >
>>  >Thank You
>>  >
>>  >Geffrey.
>>  >
>>  >
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>
>
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