How can I tell if SMTP is being blocked?

[polleyjb01]

We have a server that we want to automatically send out reports. I added the servers IP to the smtp relay. We block things via ACL's and firewalls on our network. I didn't see anything though when I looked.

The user gets port 25 not listening when they try to send a report.

Is there a way to prove its not being blocked ?

Also, in ACLS, what protocol should I use? Can i say something like permit SMPT host 10.10.5.1 10.10.2.100 0.0.0.255? Is SMTP the right protocol to name or should it be a port number?

[Eugene Khabarov]

Try telnet from one of the users machine:

telnet a.b.c.d 25

If it will hang and will accept charaters - than port is opened.

Else it will say that connection timeout.

Second. It should be port number.

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[1ashlee2794]

Hi Eugene,

The correct syntax is access-list # permit tcp host 10.10.5.1 10.10.2.100 0.0.0. 255 eq smtp

Please rate...

[Eugene Khabarov]

Yeah, I know ) This is not my question.

[flokki123]

hi brandon,

according to my ccna book you should be able to specify the name of the service, here "smtp", or the number "25".

should work both.

you could also try to see any hits, resp. any matches on the ACL with the "show access-lists" command.

regards,

florian