sending multiple emails fails at 10 recipients

I have several form which send email to multiple recipients. However, I've had the following feedback from a user:
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I created a load of test users (to avoid annoying real users any more) and sent out several messages. Everything seem to work as long as there are no more than 9 recipients, so 10 or more recipients seem to cause things to fall over. That figure of 10 may well be significant!
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Is there something I can change to rectify this?

Cheers

Chris

I'd have to look. Maybe there is something wrong with the 10th entry, or possibly this is a limit your hosting provider has that won't allow you to send 10 emails in less than a certain time frame. If you attached the page then I could confirm there is nothing wrong with it, but more likely it is an issue with the hosting setting a limit.

Thanks Ray

File attached.

Cheers

Chris

It looks like this page sends only 1 email at a time. So they filled it out 10 times and it failed on the 10th? That isn't an issue with the page. You might talk to the hosting provider to see if they have any limits.

Hi Ray

There is a limit of 100 emails at a time, so it shouldn't be a problem. I've tested it myself, and 9 emails go fine - but as soon as I add the 10th and send an email, the logs say 'Could not instantiate mail function'.

Also,

I'm trying to get the return path to be

$Email->ReturnPath = "".$rsUser->getColumnVal("UserEmail") ."";

But that always results in failure ('Could not instantiate mail function' in the logs)

I've tried all the variants I can think of, without success - it only works if there is an actual email address entered in the appropriate place, e.g. bounce@mail.com.

Cheers

Chris

ReturnPath is what shows when the email fails to send. IT should be set to an actual email address like: bounce@mail.com.

Setting the return path to the value from the To address makes no sense, since the email is sent to the return path when the To address is invalid.

This just informs you when an email is not valid so you can remove it from your list. You can probably just remove that line entirely.

That might actually be the cause of the issue you are having.

Hi Ray

Have tried various settings; currently

$Email->Redirect = "sitehome.php?message=sent";
$Email->From = "Site <no-reply@site.com>";
$Email->ReplyTo = "no-reply@site.com";
$Email->ReturnPath = "bounce@site.com";
$Email->BurstSize = "100";
$Email->BurstTime = "1";
$Email->WaitTime = "1";
$Email->CharSet = "UTF-8";
$Email->addTo("".$rsUser->getColumnVal('UserEmail') ."");
$Email->addBCC("".((isset($_POST["toEmail"]))?implode(", ",$_POST["toEmail"]):"") ."");

Still it is not getting mail if more than 9 recipients, but under 9 is OK, so long as I don't have
$Email->ReturnPath = "".$rsUser->getColumnVal("UserEmail") .""; which results in the 'Could not instantiate mail function' error log.

I'm quite befuddled by it, as it works fine on another site with the same host! Might some of the other changes we've made on the site recently have caused this email issue?

I think I may need one of your premium support sessions!

Cheers

Chris

I can try debugging in a premier support ticket. But it really appears to be a limit from your hosting provider.

Change your burst size to 1... If it is an "emails per second" issue that might solve it. If not, I can try to help in a premier support ticket.

Hi Ray

I think a support session would help - contrary to what I said earlier, I've discovered exactly the same issue on the other site - nobody's reported it!

pm