Milter-greylist

Emmanuel Dreyfus wrote:
> On Fri, Feb 29, 2008 at 06:48:50PM +1000, Michael Mansour wrote:
>> dnl # The following allows relaying if the user authenticates, and disallows
>> dnl # plaintext authentication (PLAIN/LOGIN) on non-TLS links
>> dnl define(`confAUTH_OPTIONS', `A p')dnl
> 
> Well, I have A p y (y disables anonymous login), but sendmail still refuses
> relaying for authenticated users.
> 

IIRC you need to not just support it as an AUTH_OPTION, but also have a 
TRUST_AUTH_MECH.

Check out

http://www.joreybump.com/code/howto/smtpauth.html

Which is a combo of SMTP auth and TLS.