Send thousands thousands of emails with SMTP ?

devboycpp

Hi I need to send a large number of emails as newsletter in website using SMTP protocol. The barrier is the server runs out of memory and raises an exception when emails count is large. I use a loop that iterates through an array of emails and send them. Is there any method that can mitigate this constriction. emails count is more than 100000.

fjdiewornncalwe

If you are working for a website with 100,000+ subscriptions to a newsletter, you probably work for a website that should have it's own smtp system setup to deal with this. If it doesn't, I'm a little concerned that this "newsletter" you speak of is really more of a "spamletter"...

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Not Active

If the server is running out of memory than there isn't much you can do. Even if you dispose of the objects the GC is non-deterministic so it may not free any memory in time to prevent the problems. You could try multi-threading but it would still face the same memory constraint. Another options if available is to use two, or more, SMTP servers. Sending this many emails at once would be better handled by a bulk email service. Also sending out that many emails at once you are risking your domain being blacklisted as a spammer.

I know the language. I've read a book. - _Madmatt

devboycpp

Is there a way to make sending emails slower ? For example make it take 1 hour or more to send emails to alleviate the burden. Asynchronous or some sort of that technique .

Not Active

You can always create a service the will send so many emails per hour. You are in complete control of the code.

I know the language. I've read a book. - _Madmatt

devboycpp

I know , I wanna ask "is it helpful to invoke Sleep(milliSeconds) function in the body of the loop to mitigate this problem ? " Or another technique should be used ? for example creating threads or invoking functions asynchronously ?

Pete OHanlon

Never, ever use Sleep to block processing for a period in time. It's a poor design choice.

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devboycpp

Can you give me a pragmatic way to send emails slowly to compensate for lack of server resources ?

Pete OHanlon

If you need to send that many emails, you need to run the application on a separate server (actually it should be from several servers). Never attempt to use the web server to do this because you will always be competing with HTTP traffic (plus, it's a good idea to have the SMTP protocol on a different server to the one running the HTTP protocol. Try to keep your resources separated out for security purposes).

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Forgive your enemies - it messes with their heads

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devboycpp

For some reasons we need to countenance our current server configuration with limited resources. So we don't expect ideal. The delay is not a problem even if it takes 3 hours to send them. We can run the send operation when the site traffic is on the wane.(e.g. 3 AM) What do you think then ? Thanks Regards

devboycpp

I just asked for a solution matching my current configuration ?