Hello Joebert,

The ideal solution to this is SMTP AUTH (with TLS for encryption), but since it was already mentioned, there are simpler alternatives like DRAC (for sendmail) and POP-before-SMTP that are suitable if you simply just have one mobile client.

http://mail.cc.umanitoba.ca/drac/
http://popbsmtp.sourceforge.net/

-Paul Patrick Carpio Prantilla

joebert jacaba wrote:
i have postfix and i have a mobile client which wants to send mail through my smtp server. what necessary measure i could take in order for him to send mail without making my mail server an open relay. his laptop has a wireless lan so he can have multiple ip addresses because he hops from different access point to another. strike out vpn solution since i already have that. im looking for alternatives.


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