text_combined: jorey bump qsdrjoreybumpcom andrew long wrote 02282008 1041 wed feb 27 2008 1243 pm jorey bump wrote youre proxying port 25 reconsider puts guests risk exposing login information attempt authenticate using existing configurations email clients blocking port 25 completely reasonable situation long guests use port 587 webmail proxied way implications closing port 25 public terms mtx knowing communicate back mtx none long youre blocking outgoing port 25 connections theres reason guests would need directly connect mx assuming thats meant theres need block incoming connections mx port 25 beyond usual spam prevention understand 587 standard alt port changing something nonstandard guests connect esps offer submission via port 587 dont usually webmail alternative hard advise without knowing reasoning behind offering smtp relay wireless hotspot hotel guests really internal purposes guests certainly use nonstandard port open relay even restricted subnet merely security obscurity youll want restrict access however possible sounds like biggest threat little control machines join wireless network situation id reluctant supply open relay especially since users unlikely use place esp fri 08 aug 2008 002339 0500 spam handling relayed mail