smtplib does not send to all recipients

[Steve Holden]

dccarson at gmail.com wrote:
> That seems reasonable.  However, using the 'mail' utility I can deliver
> the same mail successfully.  I assume mail is using sendmail under the
> covers, which is doing the same negotiation with the same SMTP server?
> 
The facts would appear to suggest that both sources are accepted by the 
local SMTP server - as long as you are positive both chains are indeed 
contacting the same server. Ethereal could show you this.

A possible scenario would be that the downstream SMTP chain is somehow 
discriminating against the Python-originated messages. Logs should give 
evidence here.

So, unless it's a simple typo and you are using different (email or SMTP 
server) addresses that you think are the same, see my original response, 
which included

> and you need to take the matter up with whoever runs the SMTP server. Are you sure the address is actually valid? 

Evidence for and against? These things are a pain, but with patience you 
can usually track them down. You could try explaining to a stuffed toy, 
or a sock on your hand, exactly why there can't be anything wrong with 
your code. My wife's bears are very forbearing [n.p.i.]. Whatever it 
takes to break the perceptual barrier.

We now return you to your regular episode of scheduled tasks ...

regards
  Steve
-- 
Steve Holden        +1 703 861 4237  +1 800 494 3119
Holden Web LLC             http://www.holdenweb.com/
Python Web Programming  http://pydish.holdenweb.com/