Re: SMTP relay host

2009-09-19 Thread Martin Allan Jensen
Egoitz Aurrekoetxea Aurre wrote: Is not valid for doing all you're customers mail machines to connect to a relayhost, because machines connecting to relay host smtpd server are not doing any pop against nothing. Take a list of users in all databases, do a small table in mysql set the primary ke

Re: SMTP relay host

2009-09-19 Thread Martin Allan Jensen
Michael Orlitzky wrote: If your customers have POP3/IMAP accounts, there is already a database of usernames and passwords *somewhere*. Query that. Yes there is - actually there is about six different ones - so making a system that could talk to all those authentication mechanisms would take

Re: SMTP relay host

2009-09-19 Thread Martin Allan Jensen
Ansgar Wiechers wrote: You could put your customers on a private network not accessible by the public (and I mean "VPN" kind of private here rather than RFC 1918 kind of private). However, that's just moving authentication and encryption to a different layer. Why do you want to avoid using SASL

Re: SMTP relay host

2009-09-19 Thread Martin Allan Jensen
Sahil Tandon wrote: You must setup SASL and only let authenticated users relay through this new server. Forget about contacting the other mail servers to verify that the sender email exists; that is in no way a form of authentication. http://www.postfix.org/SASL_README.html You are probably r

Re: SMTP relay host

2009-09-19 Thread Martin Allan Jensen
Sven Hoexter wrote: Does that mean that those customers run their mailserver on dynamic IP addresses? Otherwise I'd use the IP address/domain of the customers as the criteria. Sven Hi Sven, Yes, I'm sorry, forgot to give that information. They might be running dynamic IP adresses/domains,

SMTP relay host

2009-09-19 Thread Martin Allan Jensen
Hi all, The company I work for have approximately nine mail servers, including Postfix, qmail, sendmail and exim. They would like to make ONE SMTP relay host server so that all their customers can use their SMTP server to send mail through. The customers already get their incoming mail through