[Info-vax] TCPIP port 587 (was Re: Problem with SMTP)

[Snowshoe]

On 10/11/2011 4:20 PM, JF Mezei wrote:
> RLFitch wrote:
>> More information, I hope it's useful:
>>
>> If I attempt to Telnet to a SMTP server (port 25) on the new system
>> the connection fails but on the old system a connection is successful.
>
> You have a firewall which prevents outbound connections to outside SMTP
> servers, unless it comes from an approved IP. Your new server is likely
> not in that list of IPs that cam make outside conncetions to 25.

To RLFitch: Are the two systems you mentioned on different 
ISPs/networks?  I bet yes.  Due to "zombied" Windoze PC's, many ISPs now 
require all email sent to go through their servers (using port 587), and 
*not* directly to the destination (using port 25).  That's because 
zombies were/are used to send tons of spam.  And that's why I asked my 
question, is any of HP's TCP packages or add-on software aware of Port 
587 submission?  My ISP (Verizon) is one of those that block outgoing 
Port 25 connections, and the symptoms are as you describe if I try it.