On Mon, Mar 10, 2008 at 7:58 PM, Ang Kah Yik <mailinglist@bangky.net> wrote:
Hi Justin (and all others on-list)
I understand your grounds for blocking outbound SMTP for your customers (especially those on dynamic IP connections). It probably will do good to block infected customers that are spewing spam all over the world.
However, considering the number of mobile workers out there who send email via their laptops to corporate SMTP servers, won't blocking outbound SMTP affect them?
vpns fix this...
Since these corporate types (I'm guessing here) are probably unaware of how to change their email client's SMTP configurations, chances are that blocking outbound SMTP will probably cause quite a lot of pain.
uunet dialup has blocked port25 in both directions since 2002... little to no complaints. (well, they may have received complaints since I left, but... thank John StClair for the work behind that filtering actually.)
After all, there are also those who frequently move from place to place so they're going to have to keep changing SMTP servers every time they go to a new place that's on a different ISP.
many config's actually just use WCCP to transparently redirect your smtp to an authorized SMTP server as Andy Dills points out. -Chris