sendmail question (Chris Hare)

[Chris Hare]

 Thanks for the ideas - I will have to check option two out after RSA.  I
have a friend who has a valid MTA and he is routing for me at this time.
Not a big deal, but it will work for the interim.

Thanks for the ideas.

-----Original Message-----
From: redhat-list-bounces at redhat.com [mailto:redhat-list-bounces at redhat.com]
On Behalf Of Frank DiPrete
Sent: Sunday, February 12, 2006 12:30 PM
To: redhat-list at redhat.com
Subject: sendmail question (Chris Hare)

This might not be the right forum, so I apologize up front.
 
I have a situation where my ISP requires outbound SMTP to be authenticated,
such as in a mail client.  I have an application I have built that sends
email to users when there is a severe weather event.  Some of those users
are at my ISP.  (If they are not, it isn't an issue.)  Is there anyway to
configure sendmail to do outbound authenticated SMTP to another mail server?

 
This issue is also important, because this ISP (comcast) only provides a
java/macromedia web mail client, which my PDA can't access.  I have
squirrelmail running now, which it can, but since I need authenticated
outbound SMTP, I can't send email. Not very useful.
 
Thanks
Chris


Hello Chris,

I too have a comcast account and can speak to this. The problem is not so
much an smtp client problem but a sendmail / comcast issue.

Comcast's smtp server will reject any direct connection from your sendmail
daemon. I have played around with it and watched the logs closely.
Presumably this is to prevent spam relay's - although tons of spam flies
through their filters on a dialy basis which is another story ;)

You have a few options.

1) use sendmail with a valid domain /sendmail server hosted externally setup
to allow relay from your box - probably not practical for what you are
doing.

2) do not use sendmail and use ssmtp - it replaces sendmail and accepts the
sendmail command and options. This will work at getting the mail off your
box to smtp.comacast.net. I have used it in the past. The mail will come
"from" the address specified in it's configuration file. This is a trade
off.

3) re-write your app to not use your local mailer but cat a message using
smtp's syntax. see
http://en.wikipedia.org/wiki/SMTP#Example_SMTP_communication


I used option 2 with success - behind a firewall.







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