> Jonathan Berry wrote: >> On 8/27/05, Craig White <craigwhite@xxxxxxxxxxx> wrote: >> >>>On Sat, 2005-08-27 at 00:11 -0500, Jonathan Berry wrote: >>> >>>>Hey everyone, >>>> >>>>Okay, a lot of ISPs now block port 25 out to anything other than their >>>>SMTP server. In some situations, it would be nice to circumvent this >>>>to get to another SMTP server if one is not available. So what I had >>>>though is to setup my FC4 linux box to listen for SMTP traffic on a >>>>non-standard port. Actually, I could just have my hardware router >>>>forward whatever port to 25 on the computer, so the non-standard port >>>>part should be easy. It would be nice to have a workable solution >>>>with as little as possible. Does anyone know of some way that I could >>>>maybe take any traffic to my server on my chosen high port and forward >>>>it along to my ISP's SMTP server on port 25? It sounds possible, but >>>>sketchy enough to where it might not be. Any ideas? I figure I could >>>>always just setup my own SMTP server and that should work. But I >>>>would need to make sure I did that right as I do not want to aid in >>>>the spread of spam and/or viruses. Since it would be on a strange >>>>port, it shouldn't be as big a problem, if at all. Any ideas on that >>>>point? So, what do you think of my idea and options? If I were to go >>>>the route of setting up my own SMTP server (perhaps even so far as a >>>>whole email server) any tips as to where to start looking for info on >>>>doing this right? >>> >>>---- >>>There's often no reason to do what you are speaking of. >>> >>>You can set Postfix or Sendmail to use your ISP's smtp server as a >>>'smart host' so outbound email will be delivered. Then other computers >>>can use the system running Postfix or Sendmail delivering via the smart >>>host can send mail. The only issue is computers that aren't on your >>>local lan can't use your mail server to relay mail - which stands to >>>reason. >>> >>>If for some reason you really believe you need to do what you are >>>asking, the following is offered in sendmail.mc (and I presume something >>>similar is configurable for postfix) >>> >> >> [snip] >> >>>dnl DAEMON_OPTIONS(`Port=smtps, Name=TLSMTA, M=s')dnl >>> >>>and at this point - the ISP's blocking ports 25, 80, 137-139, 445 are >>>not blocking 587 >>> >>>Craig >> >> >> Okay, well I guess I should stop trying to be general and explain the >> situation. My sister is away at college right now and she has to >> connect to the internet through the university's network. Of course, >> they block port 25 out to our (home) ISP's SMTP from their network. >> The university supplies students with email, but this has to be >> accessed via a web interface. They provide IMAP connectivity for >> professors, but not students (who knows the reasoning for some >> university policies?). So to my knowledge, there is no SMTP server >> that she could use to send email with a normal client (she uses >> Windows by the way). So, what I want is to setup something to where >> should could send email to my Linux server, which would then send it >> out to my ISP's SMTP server to go wherever it needs to go. But since >> port 25 out is blocked, my server needs to listen on a different port. >> I was just going to pick some random, high number like 4539 for >> instance. So this is the desired path: >> Computer on non-standard port >> University LAN >> Internet >> My Public IP >> My Local LAN >> Linux Server >> ISP's SMTP >> Continue just like I was connecting directly to the SMTP server >> >> Does that make sense now why I want this? Is something like this >> possible? > > Yes, and the "standard" approach for this is to provide an SMTP > submission service on your Linux server (port 587). Your sister > authenticates to your server using SMTP AUTH, submits her mail just like > she would with a regular SMTP server and then your server gets on with > the job of delivering it. > > If you're using sendmail, search for "MSA" in /etc/mail/sendmail.mc > > You'll need to set up SMTP AUTH for yourself, but google is your friend > there. > > Paul. > > > -- > fedora-list mailing list > fedora-list@xxxxxxxxxx > To unsubscribe: http://www.redhat.com/mailman/listinfo/fedora-list > i know, this is a very pragramatic approach. but why not installing a webinterface like shipped-with squirrelmail on/for your mailserver? your sister surely could also send mail and receive it by this webinterface. Roger
