Are there such tutorials in Lua? filter keep proc-exec /path/to/script.lua
With above configuration, how does the script run? How is mail input given to it? At what step can I get size of attachments without downloading them. if sizeof_attach(mail)>0 return 0; Does it work like cgi, i.e. standard output? Thanking you Sagar Acharya https://humaaraartha.in/selfdost/selfdost.html 14 Oct 2023, 18:52 by kolip...@exoticsilicon.com: > On Sat, Oct 14, 2023 at 03:06:11PM +0200, Sagar Acharya wrote: > >> How do I reject all emails with attachments by using an opensmtpd filter? >> > > You need to parse the content of the emails using the data-line filter event. > > You'll probably want to check the headers for Mime-Version: and Content-Type:. > > If the message is indeed Mime encoded then look in the message body for the > Content-Type: header again, and decide whether to pass it or reject it. > > (You might want to pass some attachments such as plain text or text/html, and > reject all others.) > >> At what step do I set the filter? rcpt-to, data, or commit step? >> > > You will need to parse several events, probably at least: > > link-connect > link-disconnect > data-line > > and maybe others. > >> Any tutorials are appreciated. >> > > If you want a general tutorial about writing filters in C, you could look at: > > https://research.exoticsilicon.com/articles/mail_filters > > Some of the content is applicable to other programming languages too, but the > tutorial is based on programming in C. >
