Hello - I have a 2.x LS installation that will eventually be upgraded but I need that version now.
The issue we are having is that using my SMTP server it will cause delays and the site to hang while sending about 7000 emails out. 1000 at a time.

Can anyone explain what the process is when LS is sending emails ?
I'm seeing on average it takes about 3 seconds to send each email. This is using a SMTP server that can easily bulk send 1000's of emails with no issue.

Does LS really send one email at a time ? With 7000 emails to go out that can take quite some time at 3 seconds each email.

We send different email for each token : then need to send email one by one …

Else : SMPT connect authentication etc … if your network are bad : it can take time. Seems the case here.

Since your host yourself : you can use php mail fucntion to send to sendmail using your smtp server as relay.

maestro1315 wrote: Can anyone explain what the process is when LS is sending emails ?
I'm seeing on average it takes about 3 seconds to send each email. This is using a SMTP server that can easily bulk send 1000's of emails with no issue.

I recommend to look at this thread. The mail handling in your version of LimeSurvey might close the SMTP connection after each email too.

forums.limesurvey.org/forum/installation...-for-multiple-emails

DenisChenu wrote: We send different email for each token : then need to send email one by one …

That's no technical restriction by the environment but by the current code. It should be possible to create 10 emails with different content and then send 10 via one smtp connection too. There might be other restrictions like memoryusage or crashrisk which is lower with the current concept doing it 1 by 1.

I see a delay on the SMTP side of things so I'm starting there. It takes on average 2-3 seconds to return Message Acceptance for each email, with 8k emails that's quite a bit. Is this typical ?

2020-10-06 13:01:14 CLIENT -> SERVER: .
2020-10-06 13:01:16 SERVER -> CLIENT: 250 ok: Message 10124444 accepted

This didn't appear to be the issue and is expected behavior (2-3 second delay).

Is there a setting to change how long the LS website will wait for the SMTP emails to be sent. It will often stop and the site crashes and the user has to log in again and start sending from where it left off.

LimeSurvey uses the phpmailer library. There are defaults value in the lib.

LS4
github.com/LimeSurvey/LimeSurvey/applica...pmailer/src/SMTP.php

In LimeSurvey 2.x you will need to search for the code parts.

LS 2 use PHPMailer withoiut way to upadte it.

But clearly … if need more than 5 minutes …

I thionk it's more in PHP settings ?

Maybe default_socket_timeout ?

DenisChenu wrote: We send different email for each token : then need to send email one by one …

Else : SMPT connect authentication etc … if your network are bad : it can take time. Seems the case here.

Since your host yourself : you can use php mail fucntion to send to sendmail using your smtp server as relay.

"Since your host yourself : you can use php mail fucntion to send to sendmail using your smtp server as relay."
This sounds like what I need to try. How do I go about making the changes ?
Are the changes
1) change to PHP on the admin console
2) edit php.ini ?
3) edit class.phpmailer.php ?

I'm not certain what needs to be configured in # 2 and 3.

My problem is that for some reason LS is no longer sending multiple concurrent emails. Past SMTP server logs show that it was so I'm not certain what changed. Would using PHPMail enable that again ?

Thanks !

Hi,

It's really an idea

php.ini use surely sendmail for sending email
you can configure sendmail to use another SMTP server

See serverfault.com/questions/779593/configu...ay-on-an-smtp-server
tecadmin.net/sendmail-to-relay-emails-through-gmail-stmp/
cri.ch/linux/docs/sk0009.html
…

Then : no waiting time.

It's not the best solution (in my opinion) but do the trick.