sendmail setup

Chuck Swiger cswiger at
Tue Feb 6 21:41:09 UTC 2007

On Feb 6, 2007, at 4:35 PM, usleepless at wrote:
[ ... ]
> i ran tcpdump on the external interface, and the only thing that seems
> to happen is my machine contacting the other machines, but they never
> reply!:

Typically that means your ISP is filtering outbound connections to  
port 25.  If you've got a friendly mailhost handy, try relaying via  
the RFC-2476 MSP port, 587/tcp, instead of 25/tcp...

Otherwise, contact your ISP's tech support and have them fix their  
broken mail relays.


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