not very practicle. okay if you can plan ahead if not then you're stuffed.
(security) policies like SPF always add costs and complications, but no policies/no security have given us the disaster that SMTP is now. (And anti-spam systems that allow legit servers to violate all kinds of basic policies and requirements but still send mail are part of the problem, not part of the solution.)
To avoid ever-changing, easy-to-forget "plan ahead" (and also "plan behind") inconvenience, the universal, permanent solution, for roamers and non-roamers, is to set up a port 587 machine for "mail submission". (Authenticate and) submit your mail from anywhere to that port 587, and then your mail be relayed to Internet from your sender domain's SPF-permitted source.
This whole SMTP business got wrong-footed by allowing (unauthenticated) mail submission to the "mail relay" port 25.
Imail must allow, in some future version, both listening on relay port 25 and listening on authenticated-only submission port 587.
Len
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http://IMGate.MEIway.com : free anti-spam gateway, runs on 1000's of sites
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"Our enemies are innovative and resourceful, and so are we,'' shrub said. ``They never stop thinking about new ways to harm our country and our people, and neither do we." 5_Aug_04
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