>It'll let me receive email, but not send unless I'm logged on to one of
>their dial-up POPs.

Sounds like "POP authenticated SMTP", which isn't quite the same 
thing as SMTP auth. The former has one's POP server talking to a 
corresponding SMTP server on the same network and saying "yup, 
they're online right now". The SMTP server will allow mail to be 
relayed from the client IP in question for a predetermined (short) 
time after the POP session ends. This works because a POP account 
requires a password to be supplied, which is a reasonable guarantee 
that the client in question should be allowed to send mail (or at 
least someone can be held accountable for spam). This is transparent 
to the client and requires no special support, except that you must 
check mail (create a POP connection) before sending mail (an SMTP 
connection).

The other method, SMTP authentication or authorisation, has the mail 
client authenticating itself directly each time it connects to the 
SMTP server. This requires an extension to SMTP that's not supported 
by all that many clients (Eudora 4 and up do support it), but 
probably will be required more and more in the future.

This is a frequent issue with roaming machines like notebooks. 
Personally I use POP XTND XMIT (also supported by Eudora, since time 
immemorial), which allows the client to send mail straight through 
the POP server after authenticating as usual. The POP server then 
passes it straight to an SMTP server running on the same host. Not 
all POP server software supports XTND XMIT, but popper/qpopper can, 
and it's the most frequently encountered package out there. This also 
has the side benefit of causing my mail to always appear to originate 
from the same machine - my POP/SMTP host - so my notebook's current 
IP (and by extension its real-world location) is hidden. Which is 
good since it's none of your damn business. ;)

-- 
Marc Sira               |       [EMAIL PROTECTED]
"If you can't play with words, what good are they?"


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