Most ISP's SMTP servers limit the amount of
concurrent connections from the same source to about
10 or 20.  This is intended to prevent automatic
spamming and mail bombing runs, or to at least hinder
or limit their impact.  This is pretty much an
industry standard nowadays (along with rejecting
connections from dynamic IP addresses).

   Making the limit configurable is a good idea, and
I would suggest a default limit of no more than 20. 
Like Arno said in his post, asynchroneous connections
to the same server do not necessarily increase
performance significantly so it shouldn't matter that
much to the user.


>------- Original Message -------
>From    : Veit
Zimmermann[mailto:[EMAIL PROTECTED]
>Sent    : 3/8/2007 6:42:03 AM
>To      : twsocket@elists.org
>Cc      : 
>Subject : RE: [twsocket] SMTP connection limit

Are there providers which limit the number of
concurrent SMTP
connections? In other words: Do I have to make the
maximum number
of connections for asynchronous operation flexible
and what would
be a good practice approach (besides making it user


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