Re: Email error

[Bjørn Ruberg [Permanent Link]]

Ralf Hildebrandt wrote:
> * Ralf Hildebrandt <Ralf.Hildebrandt AT charite DOT de>:
>
>   
> > >    mail:/home/tecno2 # telnet mx.uol.com.br 25
> > >    Trying 200.221.29.129...
> > >    Connected to mx.uol.com.br.
> > >    Escape character is '^]'.
> > >       
> > Does not work. Where's the banner?
> >     
> That's fucked up:
>
> mail:~# telnet mx.uol.com.br 25
> Trying 200.221.29.129...
> Connected to mx.uol.com.br.
> Escape character is '^]'.
> Connection closed by foreign host.
>
> Ah, much better after the 4th try:
>
> # telnet mx.uol.com.br 25
> Trying 200.221.29.129...
> Connected to mx.uol.com.br.
> Escape character is '^]'.
> 220 starfury13.uol.com.br ESMTP
>
>   
Seems like they have a server farm behind a somewhat dysfunctional load 
balancer, which dispatches traffic to (at least) one host that just 
rejects traffic and (at least) one that just hangs.
$ telnet mx.uol.com.br 25
Trying 200.221.29.129...
Connected to mx.uol.com.br.
Escape character is '^]'.
Connection closed by foreign host. <-- Immediate reject

$ telnet mx.uol.com.br 25
Trying 200.221.29.129...
Connected to mx.uol.com.br.
Escape character is '^]'.
220 starfury15.uol.com.br ESMTP
quit

Connection closed by foreign host.

$ telnet mx.uol.com.br 25
Trying 200.221.29.129...
Connected to mx.uol.com.br.
Escape character is '^]'.
220 starfury25.uol.com.br ESMTP
quit

Connection closed by foreign host.

--
Bjørn