can receive all, send some and not other emails

[JimmyR]

I have read most of the emails addressing issues of being able to receive and
not send and mine issue is slightly different.

I am using a laptop computer with Outlook. Typically, I am connected to our
LAN at work via a docking station and my Outlook Incoming & Outgoing servers
have been set-up appropriately. I do not and never have "authenticated"
outgoing messages. I have no problems while at work. I also use my computer
on the road and at home. When I use a dial up modem connection, as long as I
connect to the internet through internet explorer, I have no problems using
Outlook to send and receive emails. However, if I use a wireless connection
or a high speed cable connection at a hotel I have the following problem:

1. I can receive ALL emails
2. I can send emails to anyone within our companies domain
3. I cannot send emails to anyone outside our companies domain

The error message is 550, could not relay to some or all of the recipients.
Can anyone tell me what changes I need to make?

 

[neo [mvp outlook]]

You should check with your IT staff and ask what needs to be done in order
for you to send messages to folks that are not managed by the corporate
servers. (Ideally you would authenticate to the SMTP server in order to
send messages offsite.)

 

[JimmyR]

Would this matter if it only happens when I am off-site with my laptop
computer and it only happens when I use a wireless connection or a high speed
cable connection? I don't have this happen with a dial up modem and I don't
have any problems while at work. I have tried authenticating without success
also.

I will contact our IT person, but concerned that I can be off-site and not
have the send problem be with all of my sends and not just certain addresses.

Thanks!
JR

 

[neo [mvp outlook]]

And that dialup connection connects to work or external ISP? If external
ISP is it something that the work site knows what IP address assignments a
user would get?

 

[JimmyR]

Neo,
The dial up connection connects to the ISP that we use for work, but
externally from work. They have various dial up connections all over the
country so that when I am out of town I can dial up to access the internet,
which is my home page is their home page, and then I can activate Outlook and
use it to send and receive messages. This keeps me from having to use
webmail and allows me to archive into my Outlook folders.

Jimmy

 

[neo [mvp outlook]]

I understand and it is quite possible that work has made arrangements with
this ISP that they know exactly which block of IP addresses will be assigned
when using dialup. This way they can make a rule on the server of which IP
addresses can send mail.

I know this might not make sense to you and I will try to give an example
that makes better sense...

Okay this should help... when the computer establishes a network connection
(either dialup, broadband, or LAN) the computer is issued an IP address.
This IP address is like the street address on a building. If I know exactly
what street address one comes from, I can establish a business rule of what
will (and/or won't) be allowed from that address.

So to expand on this. If I know what addresses comprise a neighborhood
(e.g. my block of IP addresses above), the rule can be expanded.

So now we come to hotel broadband vs dailup. Since a street address can
only belong to 1 building, IP addresses follow the same basic rule. Every
entity is issued a set of IP addresses that can only be used by them. The
hotel can't use what IP addresses belong to the ISP that provides dialup and
vice versa. Well, in essence when connecting via broadband at that hotel,
you have moved to a different neighborhood and it most likely breaks the
rule set on the server.

Better? Does this help why I'm referring you back to the corporate IT gods
because there is a decision and/or adjustment that needs to be made?