On Tue, Oct 19, 2004 at 05:07:26PM +0800, Gideon N. Guillen wrote:
> It can also be a problem if you're mobile/traveling and/or also using
> multiple ISPs (especially for people using pre-paid internet access).
> You're likely to use multiple SMTP servers to relay your mails.

What I've done to get around this is two-fold:

1. Any customer can use the smtp server for outbound mail if they use
smtp authentication.  All popular mail clients have this ability.

2. The smtp server also listens on port 2525 so that my customers can
still use it even if they're using an isp that blocks outbound port 25
traffic.  Earthlink is a major provider here in the US that blocks
outbound port 25.

Now I have to get domainkeys and/or spf going.

Michael
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