Email clients in Ubuntu

[NoOp]

On 08/31/2009 12:21 PM, robfleet at ix.netcom.com wrote:
> Greetings all,
> 
> I have developed a sudden strange problem that I can't seem to remedy
> so I thought I'd throw it out for comment...
> 
> I have two desktop machines running Ubuntu (9.04) in my home.  My
> machine downstairs is presently awaiting a new motherboard from IBM,
> hopefully tomorrow, but it has both XT and Ubuntu on it in a dual
> boot configuration.  My machine upstairs is configured with only
> Ubuntu 9.04 (no Windows).  Sometime in the past several days, I
> cannot get any e-mail client to send mail (whether I use Evolution or
> Thunderbird).  It receives email fine and my machine downstairs
> (before IBM determined I needed a new motherboard) was able to send
> mail while in either Windows or while running Ubuntu.  We spent quite
> a bit of time on the phone with our ISP inquiring as to whether they
> had made any recent changes to their SMTP server(s) but they claim
> not.
> 
> It is a complete mystery to me as to why my one machine can send mail
> but my other one cannot.  It does not appears to be client specific
> since the same symptom appears in Thunderbird as in Evolution.
> 
> If anyone has any suggestions, I'd love to hear 'em.
> 
> Many thanks in advance.
> 
> Rob
> 

Firewall or proxy settings blocking port 587 on that machine?

ix.netcom.com uses Earthlink mail servers:

$ host ix.netcom.com
ix.netcom.com has address 199.174.114.52
ix.netcom.com has address 199.174.114.55
ix.netcom.com has address 199.174.114.48
ix.netcom.com mail is handled by 10 mx1.earthlink.net.
ix.netcom.com mail is handled by 10 mx2.earthlink.net.
ix.netcom.com mail is handled by 10 mx3.earthlink.net.
ix.netcom.com mail is handled by 10 mx4.earthlink.net.

which require you use port 587 (smtpauth.earthlink.net) -
http://kb.earthlink.net/case.asp?article=resid7280

Recheck your settings in Thunderbird & Evolution
(smtpauth.earthlink.net:587)?