[cs615asa] hw4 security groups

[John Wierzchowski]

do you allow inbound traffic on those ports to your instance? Just something
to check...

On Fri, Apr 8, 2011 at 4:06 PM, Javed Akhtar <jakhtar at stevens.edu> wrote:

> Dear Professor,
>
> Earlier I was just testing the 'mail' command if its working on my instance
> or not, so I tried it without using telnet.
>
> As per the assignment I tried telnet later, first I tried port number 25
> which is the default port for SMTP protocol, I got a connection time out
> error
>
> telnet nexus.stevens.edu 25
> Trying 155.246.14.12...
> telnet: Unable to connect to remote host: Connection timed out
>
> Then, I changed the port to 587 since Steven's mail server works on port
> 587
> as stated in ITWIKI page. But that also didn't work. Below I am mentioning
> all what I tried.
>
> telnet nexus.stevens.edu 587
> Trying 155.246.14.12...
> Connected to nexus.stevens.edu.
> Escape character is '^]'.
> 220 nexus.stevens.edu ESMTP Postfix
> mail from: jakhtar at stevens.edu
> 250 2.1.0 Ok
> rcpt to: jakhtar at stevens.edu
> 554 5.7.1 <ec2- <http://ec2-50-17-124-180.compute-1.amazonaws.com>
> 50-17-124-180.compute-1.amazonaws.com[50.17.124.180]>: Client
> host rejected: Access denied
>
> I'd really appreciate your valuable suggestion & help in this regard.
>
> Thanks & Regards,
> Javed Akhtar
> 732-552-6243 - M
>
>
> -----Original Message-----
> From: cs615asa-bounces at lists.stevens.edu
> [mailto:cs615asa-bounces at lists.stevens.edu] On Behalf Of Jan Schaumann
> Sent: Friday, April 08, 2011 9:03 AM
> To: cs615asa at lists.stevens.edu
> Subject: Re: [cs615asa] hw4 security groups
>
> Javed Akhtar <jakhtar at stevens.edu> wrote:
>
> > I am facing one problem regarding the SMTP part of assignment. When I
> > am trying to send email from one of the instance using the program 'mail'
>
> You should not use the 'mail' program.  You should use telnet to port 25
> and
> issue the SMTP commands yourself.
>
> > Also, I got an email from AWS saying that I reached a limit on the
> > volume of email that I can send out of SMTP port 25 on my instance.
> > Does that mean, I am actually able to send emails from my instance but
> > the SMTP port is blocked at Stevens so I am not able to receive those
> sent
> emails?
>
> Sounds like Amazon throttles outbound mail per instance to prevent
> spamming.
> Try to shut down the instance and create a new one.
>
> -Jan
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