Am 27.06.12 16:08, schrieb Tilman Schmidt: > Am 27.06.2012 11:15, schrieb Götz Reinicke: >> Am 27.06.12 10:29, schrieb Fajar Priyanto: > >>> 1. Many malware have their own smtp and can send spam directly. >>> To overcome this, block port tcp 25 on your gateway, and only allow >>> your mailserver. > >> Hi, thanks for your suggestion. But for the mentioned clients thats not >> possible. :/ [...] >> We do have about 100th of freelancers 'flying in and out' of our academy >> which we cant 'restrict' by forcing tham to change there clients settings. > > Nobody *needs* port 25 from their client to a public server. > Port 25 is intended for forwarding mail from one server to the > next, not for submitting mail from a client to its server. > The standard port for sending mail from a client is 587, the > mail submission port. Using port 25 for that is arguably a > configuration error which should be corrected. > > What's more, blocking outbound port 25 is generally recommended > practice and standard for many ISPs, so your freelancers will > often face the same restriction on their home LAN, Internet > cafe or wherever else they may want to write e-mails, adding > to their motivation to fix their configuration instead of > arguing with you. Hi, you dont know the resistant to advice of our users .... ;) Any kind of plea fails most time, and as long as a lot of ISP and Mail-Hosters still allow and offer port 25 in the docs it is hard to tell why our users should change because we'r faced with problems. Long story short: I advised the use of port 587 two hours ago. FYI since than I had 169 outgoing connections to port 20 and 1 to 587. :) cheers . Götz fighting spam and resistant to advice -- Götz Reinicke IT-Koordinator Tel. +49 7141 969 82 420 Fax +49 7141 969 55 420 E-Mail goetz.reinicke at filmakademie.de Filmakademie Baden-Württemberg GmbH Akademiehof 10 71638 Ludwigsburg www.filmakademie.de Eintragung Amtsgericht Stuttgart HRB 205016 Vorsitzender des Aufsichtsrats: Jürgen Walter MdL Staatssekretär im Ministerium für Wissenschaft, Forschung und Kunst Baden-Württemberg Geschäftsführer: Prof. Thomas Schadt