[Info-vax] SMTP server using port 587 outgoing?

[glen herrmannsfeldt]

snowshoe <no at spam.please> wrote:

(snip)

> I haven't heard of no reverse DNS as being a spam setting for a 
> destination email before.

For the source, not destination.

It has been tradition for a long time for hosts to verify
incoming connections by doing a DNS reverse lookup, and then
a forward lookup on the returned name. The original address
should be one of the returned addresses. 

Note, for example, that has to be done for .rhosts or
.shosts to be at all useful. 

Some systems will wait for the DNS reply, then time out
and continue without it, (and no .rhosts lookup).
If you find connections are slow, verify the DNS
entries.
 
>> The next question you'll ask: no, there's nothing you can do about that,
>> short of a mail relay through a server with valid DNS, or getting static
>> IP with correct DNS.

For some years, I had a mail server sending mail outside from my
home net. It didn't accept incoming mail from the outside 
(and so satisfying the 'no server' TOS from my ISP). 
That worked fine for a long time, until it started to fail
for mail sent to anyone (teachers, administrators) at the 
kids' school district. Seems that they blocked all connections
from popular ISPs that weren't supposed to be sending mail
directly.

As configured, it had the advantage that inside (home)
hosts couldn't send mail directly anywhere (blocked by
firewall rules) but only indirectly through this server.
Any malware that tried wouldn't work.
 
> I know that.  I am not going to pursue this further unless the Process 
> Software SMTP stack installation is fairly trivial to configure.

> Throughout this I kept assuming HP's TCPIP stack for everything.  I 
> haven't ever worked with the others.

-- glen