Re: [twsocket] SMTP connection limit
[EMAIL PROTECTED] wrote: > Hello: >> --- 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 >> >> Hi >> >> 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 >> configurable). >> >> TIA >> > >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. Thanks, I will consider changing to one connection in a later version. For now I have to live with user configuration. Thanks also to Arno and Francois. BTW: I used one of the SMTP examples as a guideline, which also uses one connection per mail sending multiple mails at the same time (if I didn't misunderstand the intention of the example). Maybe it should be mentioned in the example that this is not the preferred method. Regards -- * * Dipl.-Ing. Veit Zimmermann [EMAIL PROTECTED] * * VECTRONIC Aerospace GmbH www.vectronic-aerospace.com * * Carl-Scheele-Str. 12 tel: +49 (0)30 6789 4990 * * D-12489 Berlin fax: +49 (0)30 6789 5230 * * Germany WGS84: 52°25.83'N 13°31.52'E * * -- To unsubscribe or change your settings for TWSocket mailing list please goto http://www.elists.org/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
Re: [twsocket] SMTP connection limit
Hello: 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. -dZ. >--- 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 > >Hi 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 configurable). TIA -- To unsubscribe or change your settings for TWSocket mailing list please goto http://www.elists.org/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
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 configurable). There is no limit imposed by the component. But the OS and of course the server will limit the number of concurrent connections. -- Contribute to the SSL Effort. Visit http://www.overbyte.be/eng/ssl.html -- [EMAIL PROTECTED] http://www.overbyte.be -- To unsubscribe or change your settings for TWSocket mailing list please goto http://www.elists.org/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
Re: [twsocket] SMTP connection limit
Veit Zimmermann wrote: > Hi > > Are there providers which limit the number of concurrent SMTP > connections? Most likely. > 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 configurable). I don't know how connections were rejected when the limit is reached. I think that multiple connections to the same mail server do not improve speed much. Probably the fastest method was sending multiple E-Mails in a single session one after the other. --- Arno Garrels [TeamICS] http://www.overbyte.be/eng/overbyte/teamics.html -- To unsubscribe or change your settings for TWSocket mailing list please goto http://www.elists.org/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
[twsocket] SMTP connection limit
Hi 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 configurable). TIA Veit -- To unsubscribe or change your settings for TWSocket mailing list please goto http://www.elists.org/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
