Hi Many thanks for this information.
Matthew On Fri, Jun 29, 2001 at 08:23:56AM +0200, Michael Wood wrote: > Hi > > On Thu, Jun 28, 2001 at 10:00:27PM +0100, Matthew Sackman wrote: > > Hi Guys, > > > > When you send an email and it goes to the smtp server, that > > server then tries to connect to the mail exchange for the > > domain which the email is going to. > > > > Will it connect to this mail exchange from port 25, or will it > > open another unpriveledged port? I'm just wondering whether I > > can set a firewall option to only allow connections to the > > smtp server if it comes from port 25. > > SMTP clients (including other SMTP servers sending your SMTP > server mail) use an unpriveleged port as the source port. (I > suppose some clients could use port 25, but I've never seen > that.) > > i.e. if you add a rule to allow only tcp src port 25 to tcp dst > port 25, you will not get mail. > > -- > Michael Wood | Tel: +27 21 762 0276 | http://www.kingsley.co.za/ > [EMAIL PROTECTED] | Fax: +27 21 761 9930 | Kingsley Technologies > > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] > > -- Matthew Sackman Nottingham, ENGLAND Using Debian/GNU Linux Enjoying computing It said 'Required Windows XP or better.' So I installed Linux.
