Phorm and Cookies

[Chris Edwards]

On Thu, 3 Apr 2008, Peter Fairbrother wrote:

| Sendmail can send mail direct to someone's server, outlook can't it has to go
| through a mail server (MTA).
| 
| If you use sendmail then you are the SMTP client - if you use outlook then you
| aren't, the mailserver you use is.

OK - the mailserver (MTA) operated by your email service provider acts 
first of all as a server (to accept your mail), then as a client (to 
deliver it to the remote destintation).

The dialog between your PC and your email service provider's server should 
preferably use the submission port (TCP 587), with authentication, and 
hopefully TLS.  The result is you should be able to send mail regardless 
of where in the world you plug in, irrespective of whether port 25 is 
blocked or not.

Meanwhile, port 25 is becoming dedicated to MTA->MTA traffic.  Which means 
connectivity providers can block port 25 for end users, and thus spambots 
are hampered.