Re: [Nolug] Email for Out of the Office

"Kent Busbee" <KentAndLauren@charter.net> writes:

> Is there a way to configure Sendmail to accept SMTP connections from valid
> users with accounts who are on their laptops out of the office? In
> particular, how can you have the following:
>
> 1. Avoiding open-relay and making it secure
> 2. Avoiding baulks from other email systems because the email is not
> "originating" from the email server.
> 3. Working with standard email clients such as outlook.
> 4. Configure it seamlessly so that whether out of the office (personal ISP
> internet), or in the office (Intranet), their email program works without
> changing settings.
> 5. Avoid SMTP port blocks from personal ISPs

Actually, it's kinda complicated. The protocol you're looking for is
called "submission" and you'd configure it to run on port 587. You
configure it so it only allows mail relay from users running SMTP+AUTH
and use SSL TLS for encryption. This will meet your requirements.
Users will have to change their settings once to use "SMTP" on port
587 as well as setting up TLS and SMTP+AUTH. You would probably also
have to split your DNS configuration for "mail.yourdomain.com" is
appropriately addressed inside the firewall (ie. behind NAT) and
outside.

I do this now, but I do it with Postfix. It's fairly complex
to setup. There is a fairly nice howto on Gentoo's website in
their forum "Documentation Tips and Tricks" on setting up a home
mail server. There's undoubtedly some howto;s out there on how to
set up sendmail to do this as well since it's so common.

-- 
Scott Harney<scotth@scottharney.com>
"Asking the wrong questions is the leading cause of wrong answers"
gpg key fingerprint=7125 0BD3 8EC4 08D7 321D CEE9 F024 7DA6 0BC7 94E5
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