if i'm not mistaken, if you use portforward for smtp, then the antispam would not work.
nadia007 wrote: > > Well... I'm excited to say that my theory worked like a charm!!! > > By creating a portforwarding rule on EFW I was able to get my users to > bypass the proxy and relay their messages off the mail server directly. > The mail server will only relay messages that pass authentication, so even > if people know the port, they still can't relay unless they are able to > authenticate. > > I've tested my site on the open relay web tests and the site passes with > flying colors... ;) > > Nadia > > > nadia007 wrote: >> >> Peter; >> >> Thanks for the reply! At the moment we do have our users relaying >> through their individual ISP's. Unfortunately this method isn't very >> reliable. Most of the ISP now days only allow users that are on their >> network to relay on their network. So when our user's are at a remote >> location using an ISP other than their own (like at a hotel), they can't >> use their outlook to send their mail because their personal ISP rejects >> any relay's done outside of their network. >> >> I think I understand what you're saying. The SMTP proxy will capture any >> requests coming or going from and to the mail server. This is how it is >> able to filter out the spam/virus and relay requests. But in my case if >> I wanted the users to be able to relay from our office, I'll need >> something that will be able to authenticate the user and then relay the >> mail. >> >> What if I changed the port that my users use for SMTP? By default SMTP >> runs on port 25 and that is the port that the proxy uses. But what if I >> did a port forward on EFW to listen on port 1010 (for example) and >> forward to the mail server on port 25. On the client I would then tell >> it to send outgoing mail to port 1010, instead of the traditional port >> 25? In theory this would bypass the proxy on port 25 and allow the users >> to get to the mail server to authenticate. My server wouldn't be an open >> relay since the user has to have their username and password to >> authenticate before it sent any mail out. >> >> Thanks for the infor Peter, I'll do some experimenting and inform the >> mailinglist of my findings for anyone that is interested. >> >> Nadia. >> >> >> >> >> Peter Warasin wrote: >>> >>> hi >>> >>> nadia007 wrote: >>>> also send and receive just fine. Unfortunately my remote users that >>>> are >>>> using their outlook and using either using IMAP or POP3 are having a >>>> very >>>> difficult time sending email through the mail server. >>> >>>> postfix/smtpd[4496]: NOQUEUE: reject: RCPT from unknown[208.11.90.100]: >>>> 554 >>>> : Relay access denied; from= to= proto=SMTP helo= >>> >>> as far as i understood you would like to allow people to use your local >>> efw as an smtp for remote users. >>> >>> efw is only designed to act as an smtp proxy, which means it intercepts >>> outgoing connections from a client to an smtp server, and backwards, a >>> connection from the outside to your local mailserver. >>> >>> what you try to do is using the firewall directly as an smtp in order to >>> allow people to relay mails through it. >>> this does not work, because otherwise you would have an open relay which >>> allows spammer to send mails over it wherever they want. >>> >>> you solve this by letting your remote users use their providers smtp >>> server, which has to allow relaying mails from its own local ip >>> addresses. >>> >>> peter >>> >>> -- >>> :: e n d i a n >>> :: open source - open minds >>> >>> :: peter warasin >>> :: http://www.endian.it :: [EMAIL PROTECTED] >>> >> >> > > -- View this message in context: http://www.nabble.com/Relay-Access-Denied-tf2347990.html#a6560077 Sent from the efw-user mailing list archive at Nabble.com. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Efw-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/efw-user
