Outlook - Can't Send out

I've been reading the various Outlook and OutExpress (OE) notes about email problems but no solutions that seem to apply, so posting this to clarify a little.

Cpanel:
email acct set up, works both recv-in and send-out in webmail, Horde. All works ok. I have 3 accounts under one Billing name, but 3 differenc logins to cpanel.

Desktop: (example info)
Outlook (and tried w/OE) settings.
Acct name doe@web.com
POP3: mail.web.com (also used the IP)
SMTP: mail.web.com

Acct: doe@web.com
psrd: doeweb
remember password= yes
authentication: yes and no tried both

Port: 25
Income: 110


~~~~Errors out when sending ~~~
0x800CCC0E FAILED_TO_CONNECT Cannot connect to server.
0x800CCC0F CONNECTION_DROPPED Connection closed.

Checked the links suggested, but as you can see not much help.

Running Norton Antivirus and Norton Internet Sec
Tried disabling both, no affect.

Webhost tried with new accounts set up on their machines and cpanel, worked ok for them - they sent from home box & I recieved ok - I couldn't reply - errored out (above). Would suggest that it's on my desktop. Not sure that it is.

Desktop recieves all e-mails just fine.
If replying or trying to send one out, I just get the above errors. Out box is full of e-mails waiting to go.
I have deleted and re-set up accounts trying various settings, both on desktop and cpanel.
It seems to me, what little I know, that the send mail is knocking on the webhosts door, but can't get in. I'm thinking it's a block on that end. They use Spamassin, but claims has nothing to do with it as other, includeing there machines don't have a problem.

anythoughts??
thanx

 

Ok checked with telnet 25 = no connection

Webhost checked, spam blockers etc.
changed to 26 and 1025..

He could connect I couldn't, tried telnet on both name
mail.web.com and ip 123.45.67..... 25, 26, 1025

He is able to make connections
I get error messages like "connection to host lost..."

Also host ran a test from the server and it says your email from that site is working good - guess through cpanel

Next step??

thanx, I thought we had somethingthere...

Also norton Internet Security popup Allow it to go through so would guess it's not be blocked by norton...

thanx

 

working now...

Thanx much Lady Di.... and for your fast response..
that, in this day and age, is greatly appreciated..
You were on the right track....

Host turned on extra port for exim on 26

I rebooted, changed to port 26 and it worked...

thanks to all.

Whew, on to the next one...