Date: Mon, 29 Jul 2002 19:32:36 -0400 (EDT) From: Jason Hunt <leth@primus.ca> To: freebsd-questions@FreeBSD.ORG Cc: Mike <root@unixhideout.com>, Lee <lee@unassemble.co.uk> Subject: Re: Allowing controlled relay with sendmail. Message-ID: <20020729192307.M7050-100000@lethargic.dyndns.org> In-Reply-To: <1317.192.168.1.10.1027979939.squirrel@email.unixhideout.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Mon, 29 Jul 2002, Mike wrote: > Thats why i asked for allowing "controlled" relay with sendmail. How is > that a spam security issue? smtp_auth will require a user and password > before they send. Am i missing something? > SMTP AUTH would work. There are also some ways of doing "POP befoe SMTP", where it will not allow you to send mail until you sucessfully complete a POP3 session. That is kind of messy. Keep in mind that by opening up your mail server to let users from other ISPs relay through you, you are becoming an open relay yourself. Also, a lot of ISPs do not allow customers to use SMTP servers on anothe network. Bell Sympatico appears to block un-established outbound port 25 packets on their border routers. UUNet has access lists applied to their NASes. AOL redirects any outbound port 25 packets to their own SMTP server. Basically, anyone that is on an ISP doing these kinds of things will not be able to connect to your mail server for SMTP at all, even if you do use SMTP AUTH. Might be something to keep in mind. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20020729192307.M7050-100000>