On Saturday 25 November 2006 20:24, Eric B. wrote:
Would it be very difficult to update stunnel and make it a configurable option to insert the originating IP as a header in the mail? ex: something like X-st-originating-IP: or something like that.
Since adding a header to each email address within a connection requires building SMTP parser - I could say it's very difficult. Probably a wealthy sponsor could make me change my mind, but otherwise such change obviously breaks the KISS principle that stunnel is based on.
Am actually using an anti-spam proxy in front my my SMTP server which doesn't have native SSL support (ASSP). And if I use the SMTP server's SSL support, I'll completely be bypassing the AntiSpam proxy which will completely defeat the purpose of anti-spam.
What about installing an SMTP router in front with RBL support, than your anti-spam proxy, than another instance of SMTP server for local delivery? For sure it's easier than adding another feature to stunnel. I use a similar configuration for antivirus scanner based on Postfix.
Are there really a lot of spammers that use SSL to send spam?
Actually, yes. There are a significant number of spammers that use SSL mainly b/c a lot of systems don't check SSL ports against spam, etc. It is becoming more and more prevalent. I woudl have to say that at least 50-60% of the spam comes via the SSL port.
I didn't know that. Thank you.
Mike