Remote Mail via Sendmail 8.12.2 and SMTP ?
Hi ! I administer a small network of Linux and Windows boxes, using a SuSE 8.0 Professional box as router, firewall and mail server. Everything is running fine right now, except for one little thing : I want my users to connect to my mail server from outside my domain, so that they can send e-mails using their mail accounts on my server. Right now, they can download their mail from outside via POP3, but are not allowed to send any mails, unless the mail is addressed to a local mail address. What do I have to do so that my users can use their local accounts to send mails to non- local addresses. For security and anti- spam reasons I´d like to implement some sort of POP3 before SMTP- policy so that only authenticated users can send mails. I use Sendmail 8.12.2, no modifications. Any suggestions ? Thanks
On Thursday 14 August 2003 00:58, remote wrote:
Hi !
I administer a small network of Linux and Windows boxes, using a SuSE 8.0 Professional box as router, firewall and mail server. Everything is running fine right now, except for one little thing :
I want my users to connect to my mail server from outside my domain, so that they can send e-mails using their mail accounts on my server. Right now, they can download their mail from outside via POP3, but are not allowed to send any mails, unless the mail is addressed to a local mail address. What do I have to do so that my users can use their local accounts to send mails to non- local addresses. For security and anti- spam reasons I´d like to implement some sort of POP3 before SMTP- policy so that only authenticated users can send mails. I use Sendmail 8.12.2, no modifications.
Any suggestions ?
Thanks
Google up "popauth" which is a modification for sendmail. Enforce apop shared secrets too (virtually all mailers support this) so that real passwords are not transmitted in pop3 sessions. For users with even a mild degree of sophistication putty can be used to establish a ssh session and forward port 25 to your mail server from your gateway/firewall or where ever. But this may be more trouble than its worth. -- _____________________________________ John Andersen
Hi, remote schrieb:
Hi !
I administer a small network of Linux and Windows boxes, using a SuSE 8.0 Professional box as router, firewall and mail server. Everything is running fine right now, except for one little thing :
I want my users to connect to my mail server from outside my domain, so that they can send e-mails using their mail accounts on my server. Right now, they can download their mail from outside via POP3, but are not allowed to send any mails, unless the mail is addressed to a local mail address. What do I have to do so that my users can use their local accounts to send mails to non- local addresses. For security and anti- spam reasons I´d like to implement some sort of POP3 before SMTP- policy so that only authenticated users can send mails. I use Sendmail 8.12.2, no modifications.
For Security reasons you should use SSL secured POP/IMAP and authenticated and SSL secured SMTP ;-) You can use a second MTA instance on a different Port if you need Port 25 configured with Spam Protection and without authentication. Dirk
Grumpfl, and you`re Mailserver should be somewhat more polite to people helping you. ;.-(( Thread 1: 11:43:51 [<-->] : Connecting to router.leat.ruhr-uni-bochum.de Thread 1: 11:43:56 [--->] : 421 SMTP service not available, closing transmission channel Thread 1: 11:43:56 [<-->] : Error: 421 SMTP service not available, closing transmission channel Thread 1: 11:43:56 [<-->] : Connecting to mi.ruhr-uni-bochum.de Thread 1: 11:43:58 [--->] : 220 c1-1-5.rz.ruhr-uni-bochum.de ESMTP Thread 1: 11:43:58 [<---] : HELO Direct-Client Thread 1: 11:43:58 [--->] : 250 c1-1-5.rz.ruhr-uni-bochum.de Thread 1: 11:43:58 [<---] : MAIL FROM: <dirk.schreiner@tria.de> Thread 1: 11:43:58 [--->] : 250 ok Thread 1: 11:43:58 [<---] : RCPT TO: <> Thread 1: 11:43:58 [--->] : 250 ok Thread 1: 11:43:58 [<---] : DATA Thread 1: 11:43:58 [--->] : 354 go ahead Thread 1: 11:43:59 [--->] : 250 ok 1061200062 qp 17468 Thread 1: 11:43:59 [<---] : QUIT Thread 1: 11:43:59 [--->] : 221 c1-1-5.rz.ruhr-uni-bochum.de Check out DNS too ;-) Sorry to the List found no other way contacting remote... Dirk Dirk Schreiner schrieb:
Hi,
remote schrieb:
Hi !
I administer a small network of Linux and Windows boxes, using a SuSE 8.0 Professional box as router, firewall and mail server. Everything is running fine right now, except for one little thing :
I want my users to connect to my mail server from outside my domain, so that they can send e-mails using their mail accounts on my server. Right now, they can download their mail from outside via POP3, but are not allowed to send any mails, unless the mail is addressed to a local mail address. What do I have to do so that my users can use their local accounts to send mails to non- local addresses. For security and anti- spam reasons I´d like to implement some sort of POP3 before SMTP- policy so that only authenticated users can send mails. I use Sendmail 8.12.2, no modifications.
For Security reasons you should use SSL secured POP/IMAP and authenticated and SSL secured SMTP ;-) You can use a second MTA instance on a different Port if you need Port 25 configured with Spam Protection and without authentication.
Dirk
Ups sorry to all, must be the heat. There ist nothing wrong with the mailserver. I somehow realized 354 go ahead as go away ;-(( and as my MTA had trouble with the DNS the mail first couldn`t be sent. Greetings Dirk Dirk Schreiner schrieb:
Grumpfl,
and you`re Mailserver should be somewhat more polite to people helping you. ;.-((
Thread 1: 11:43:51 [<-->] : Connecting to router.leat.ruhr-uni-bochum.de Thread 1: 11:43:56 [--->] : 421 SMTP service not available, closing transmission channel Thread 1: 11:43:56 [<-->] : Error: 421 SMTP service not available, closing transmission channel Thread 1: 11:43:56 [<-->] : Connecting to mi.ruhr-uni-bochum.de Thread 1: 11:43:58 [--->] : 220 c1-1-5.rz.ruhr-uni-bochum.de ESMTP Thread 1: 11:43:58 [<---] : HELO Direct-Client Thread 1: 11:43:58 [--->] : 250 c1-1-5.rz.ruhr-uni-bochum.de Thread 1: 11:43:58 [<---] : MAIL FROM: <dirk.schreiner@tria.de> Thread 1: 11:43:58 [--->] : 250 ok Thread 1: 11:43:58 [<---] : RCPT TO: <> Thread 1: 11:43:58 [--->] : 250 ok Thread 1: 11:43:58 [<---] : DATA Thread 1: 11:43:58 [--->] : 354 go ahead Thread 1: 11:43:59 [--->] : 250 ok 1061200062 qp 17468 Thread 1: 11:43:59 [<---] : QUIT Thread 1: 11:43:59 [--->] : 221 c1-1-5.rz.ruhr-uni-bochum.de
Check out DNS too ;-)
Sorry to the List found no other way contacting remote...
Dirk
participants (3)
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Dirk Schreiner -
John Andersen -
remote