[colug-432] smtp filters

[Brian Miller]

On 04/22/2013 04:07 PM, Rob Stampfli wrote:
> On Mon, Apr 22, 2013 at 09:36:04AM -0400, Scott Merrill wrote:
>> I've been kicking around the idea of migrating my email off of Google
>> Apps. I'd lose a fair bit of integrated functionality on which I've
>> come to rely, I realize, but I think there may be some long-term
>> benefits to being responsible for my own communications.
>
> I use sendmail as the MTA for my cboh.org domain, since that's what
> I've always used and know my way around.  Postfix is probably a similar
> setup.  I have two MX addresses, homed to virtual servers for the
> cboh.org domain.  When a message is received for me, it is forwarded
> to a local MTA on my local LAN.  The forwarding is done on an unusual
> port and relies on my local external IP address not being vary labile,
> but that has not been a problem here since I switched to WOW, even
> though it is nominally a dynamic address.  (It did become a problem
> with Insight -- long story -- and was the driving force behind my
> switching providers.)  The LAN server's /var/mail directory is then
> mounted on my local Linux boxes via NFS, or is directly accessible
> via ssh/mutt.
>
> I use a combination of greylisting, DNSBL, pre-greeting, and clamav on
> the virtual servers.  Have toyed with the idea of adding something like
> spamassassin, but never gotten around to studying it enough to understand
> how to incorporate it.  Also, even if someone might devine the private
> port number, the local server is further protected by rules that only let
> it respond to the IP addresses of my external servers.
>
> On the whole, it works well, but it does come with a significant amount
> of administrative overhead.  I'm fairly sure, though, that no one is
> reading my emails over my shoulder.
>
> Scott, if you have any interest in what I'm doing, or would like to see
> how all of this is achieved in a sendmail configuration, feel free to
> contact me off-line.
>
> Rob



Rob,
This sounds like a good idea for a COLUG presentation.