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SMTP - single session for multiple emails

bdeprez
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5 years 4 months ago #190094 by bdeprez

SMTP - single session for multiple emails was created by bdeprez

Hi all,

Our SMTP infrastructure is going to implement new restrictions where a single sender host will only be allowed to open 30 sessions / minute with the SMTP server.

The current behavior of Limesurvey is as follows:
- open session
- send email 1
- close session
- open session
- send email 2
- close session

For us to adapt to the new restrictions, it would need to be:
- open session
- send email 1
- send email 2
- close session

Now, I have no idea if that is at all possible with Limesurvey?

Note: I can't use sendmail or the likes either. And I'm also still on 2.73.1 since IE is still very much the standard browser in our environment (Chrome is available but needs survey admins to install it first)

Thanks in advance,
B.

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DenisChenu
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5 years 4 months ago #190113 by DenisChenu

Replied by DenisChenu on topic SMTP - single session for multiple emails

I don't know if it's possible (out of LimeSurvey system …) see the rfc : tools.ietf.org/html/rfc821#section-3.1

But something i didn't understand

> Our SMTP infrastructure is going to implement new restrictions where a single sender host will only be allowed to open 30 sessions / minute with the SMTP server.

You need something, but your infrastructure can not offer ? Then change your infrastructure …

They can allow it for specific system , from specific user etc …

Assistance on LimeSurvey forum and LimeSurvey core development are on my free time.
I'm not a LimeSurvey GmbH member. - Professional support - Plugins, theme and development .
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jelo
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5 years 4 months ago #190132 by jelo

Replied by jelo on topic SMTP - single session for multiple emails

DenisChenu wrote: I don't know if it's possible (out of LimeSurvey system …) see the rfc : tools.ietf.org/html/rfc821#section-3.1

What do you mean? I don't see any special there?

If LimeSurvey is running with a SMTP session restriction some issues will pop up.
E.g. when using notification mails. Depending on how the SMTP session restriction is done, respondents will not be able to submit a survey when notification emails are activated. The submission of an survey would trigger the smtp mail code and would hang there. I haven't tested it in 2019, so the code might have been improved. I don't use LimeSuvey for mailings (features are lacking and separating response data from contact data helps for data protection).

The meaning of the word "stable" for users
www.limesurvey.org/forum/development/117...ord-stable-for-users

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DenisChenu
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5 years 4 months ago - 5 years 4 months ago #190135 by DenisChenu

Replied by DenisChenu on topic SMTP - single session for multiple emails

jelo wrote:
DenisChenu wrote: I don't know if it's possible (out of LimeSurvey system …) see the rfc : tools.ietf.org/html/rfc821#section-3.1
What do you mean? I don't see any special there?

OK, right phpMailer have such options

And more : i'm sure at 100% it was most easy to fix the restriction than to do a plugin …

See
1. gitlab.com/SondagesPro/mailing/eventBeforeTokenEmailExtended
2. SMTPKeepAlive

Assistance on LimeSurvey forum and LimeSurvey core development are on my free time.
I'm not a LimeSurvey GmbH member. - Professional support - Plugins, theme and development .
I don't answer to private message.

Last edit: 5 years 4 months ago by DenisChenu.

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jelo
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5 years 4 months ago - 5 years 4 months ago #190136 by jelo

Replied by jelo on topic SMTP - single session for multiple emails

DenisChenu wrote: open session
- send email 1
- send email 2
- close session

I see. Yes, I don't think if LimeSurvey is used for e.g. mailing invitations, the SMTP is closed after every single emailadress. That makes no sense. Perhaps a glitch in the code, but not the intended behavior.

The default config had a 50 limit to prevent timeout in PHP.

Code:

$config['maxemails']          = 50; // The maximum number of emails to send in one go (this is to prevent your mail server or script from timeouting when sending mass mail)

@bdeprez might be able to explain when LimeSurvey is closing the session after every email (even if more than one email should be send).

The meaning of the word "stable" for users
www.limesurvey.org/forum/development/117...ord-stable-for-users

Last edit: 5 years 4 months ago by jelo.

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DenisChenu
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5 years 4 months ago #190137 by DenisChenu

Replied by DenisChenu on topic SMTP - single session for multiple emails

Else :

See
1. gitlab.com/SondagesPro/mailing/eventBeforeTokenEmailExtended
2. SMTPKeepAlive

BUT : think it's mots easy to fix SMTP server …

Assistance on LimeSurvey forum and LimeSurvey core development are on my free time.
I'm not a LimeSurvey GmbH member. - Professional support - Plugins, theme and development .
I don't answer to private message.

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bdeprez
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5 years 4 months ago #190157 by bdeprez

Replied by bdeprez on topic SMTP - single session for multiple emails

Hi all,

thanks for the quick reply!

@jelo - it does indeed close the connection after each email (see debug details):

Code:

Invitation sent to:1: Recipient 1 (recipient1@domain.com)
 
SMTP debug output:
2019-10-21 19:03:46  SERVER -> CLIENT: 220 mail.domain.com Microsoft ESMTP MAIL Service, Version: 7.0.6001.18000 ready at  Mon, 21 Oct 2019 20:03:46 +0100
2019-10-21 19:03:46  CLIENT -> SERVER: EHLO senderhost.domain.com
2019-10-21 19:03:46  SERVER -> CLIENT: 250-mail.domain.com Hello [10.198.34.175]
                                       250-TURN
                                       250-SIZE 2097152
                                       250-ETRN
                                       250-PIPELINING
                                       250-DSN
                                       250-ENHANCEDSTATUSCODES
                                       250-8bitmime
                                       250-BINARYMIME
                                       250-CHUNKING
                                       250-VRFY
                                       250 OK
2019-10-21 19:03:46  CLIENT -> SERVER: MAIL FROM:<survey@domain.com>
2019-10-21 19:03:46  SERVER -> CLIENT: 250 2.1.0 survey@domain.com....Sender OK
2019-10-21 19:03:46  CLIENT -> SERVER: RCPT TO:<srecipient1@domain.com>
2019-10-21 19:03:46  SERVER -> CLIENT: 250 2.1.5 recipient1@domain.com
2019-10-21 19:03:46  CLIENT -> SERVER: DATA
2019-10-21 19:03:46  SERVER -> CLIENT: 354 Start mail input; end with <CRLF>.<CRLF>
BODY REMOVED
2019-10-21 19:03:46  CLIENT -> SERVER: .
2019-10-21 19:03:46  SERVER -> CLIENT: 250 2.6.0  <80be62354285e767a248bb011be326e6@senderhost.domain.com> Queued mail for delivery
2019-10-21 19:03:46  CLIENT -> SERVER: QUIT
2019-10-21 19:03:46  SERVER -> CLIENT: 221 2.0.0 mail.domain.com Service closing transmission channel
 
Invitation sent to:  2: Recipient 2 (recipient2@domain.com)
 
SMTP debug output:
2019-10-21 19:03:46  SERVER -> CLIENT: 220 mail.domain.com Microsoft ESMTP MAIL Service, Version: 7.0.6001.18000 ready at  Mon, 21 Oct 2019 20:03:46 +0100
2019-10-21 19:03:46  CLIENT -> SERVER: EHLO senderhost.domain.com
2019-10-21 19:03:46  SERVER -> CLIENT: 250-mail.domain.com Hello [10.198.34.175]
                                       250-TURN
                                       250-SIZE 2097152
                                       250-ETRN
                                       250-PIPELINING
                                       250-DSN
                                       250-ENHANCEDSTATUSCODES
                                       250-8bitmime
                                       250-BINARYMIME
                                       250-CHUNKING
                                       250-VRFY
                                       250 OK
2019-10-21 19:03:46  CLIENT -> SERVER: MAIL FROM:<survey@domain.com>
2019-10-21 19:03:46  SERVER -> CLIENT: 250 2.1.0 survey@domain.com....Sender OK
2019-10-21 19:03:46  CLIENT -> SERVER: RCPT TO:<recipient2@domain.com>
2019-10-21 19:03:46  SERVER -> CLIENT: 250 2.1.5 recipient2@domain.com
2019-10-21 19:03:46  CLIENT -> SERVER: DATA
2019-10-21 19:03:46  SERVER -> CLIENT: 354 Start mail input; end with <CRLF>.<CRLF>
BODY REMOVED
2019-10-21 19:03:46  CLIENT -> SERVER: .
2019-10-21 19:03:46  SERVER -> CLIENT: 250 2.6.0  <4d0b80f6030962bcd78215a28fcf2d5a@senderhost.domain.com> Queued mail for delivery
2019-10-21 19:03:46  CLIENT -> SERVER: QUIT
2019-10-21 19:03:46  SERVER -> CLIENT: 221 2.0.0 mail.domain.com Service closing transmission channel
All emails were sent.

@DenisChenu:

We can't change out SMTP server settings - it will be a long road before that happens...

But thank you for your suggestions!

Would I need both 1. and 2. or would 2 just be sufficient?

I see in a topic on stackoverflow re item 2 (see: this link ):

Code:

Just set to true the SMTPKeepAlive property and after the bulk sending, call implicitly the SmtpClose() method.
 
$phpMailer = New PHPMailer();
$phpMailer->isSMTP();
$phpMailer->SMTPKeepAlive = true;
 
for ( ... ) {
    // Send your emails right away
    [ ... ]
}
 
$phpMailer->SmtpClose();

so I'll have to investigate where to add this "$phpMailer->SmtpClose();"

Thanks,
B.

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DenisChenu
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5 years 4 months ago - 5 years 4 months ago #190163 by DenisChenu

Replied by DenisChenu on topic SMTP - single session for multiple emails

bdeprez wrote: We can't change out SMTP server settings - it will be a long road before that happens...

IT must be a services for other services … IT must not control other servives

bdeprez wrote: But thank you for your suggestions!

Would I need both 1. and 2. or would 2 just be sufficient?

No,

I think you need to take eventBeforeTokenEmailExtended and fix, and hack the way of set the phpMailer or create a plugin using this plugin.

Adding

$this->PhpMailer->SMTPKeepAlive = true;

inside setPhpMailer function

And

$this->PhpMailer->smtp->reset();

inside the reset part

And
Remlind to close smpt at end.

Assistance on LimeSurvey forum and LimeSurvey core development are on my free time.
I'm not a LimeSurvey GmbH member. - Professional support - Plugins, theme and development .
I don't answer to private message.

Last edit: 5 years 4 months ago by DenisChenu.

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bdeprez
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5 years 3 months ago - 5 years 3 months ago #190932 by bdeprez

Replied by bdeprez on topic SMTP - single session for multiple emails

Took a while for me to get back to this but I think I'm halfway there... @DenisChenu

In your plugin, I added this:

Code:

$this->PhpMailer->SMTPKeepAlive = true;

and now it neatly keeps the session open and resets it after each email (that seems to be part of the standard behavior of phpmailer.php):

Code:

2019-11-09 21:18:23  CLIENT -> SERVER: RSET
2019-11-09 21:18:23  SERVER -> CLIENT: 250 2.0.0 Ok

But now I need to close the session all together at the end - and that's where I don't know how to proceed...

And
Remlind to close smpt at end.

I think the only place that would work is in the "tokens.php" but then how to invoke that action?

Suggestions?

Last edit: 5 years 3 months ago by bdeprez.

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DenisChenu
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5 years 3 months ago #190989 by DenisChenu

Replied by DenisChenu on topic SMTP - single session for multiple emails

bdeprez wrote:
I think the only place that would work is in the "tokens.php" but then how to invoke that action?

Arg … right …

Totally unsure , since need to know the number still in queue ?

Maybe find the number with Yii::app()->getConfig('maxemails') and github.com/LimeSurvey/LimeSurvey/blob/ef...min/tokens.php#L1340 ?????

Assistance on LimeSurvey forum and LimeSurvey core development are on my free time.
I'm not a LimeSurvey GmbH member. - Professional support - Plugins, theme and development .
I don't answer to private message.

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Mazi
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5 years 3 weeks ago #193437 by Mazi

Replied by Mazi on topic SMTP - single session for multiple emails

@bdeprez, would it be possible to share your solution later?

Best regards/Beste Grüße,
Dr. Marcel Minke
survey-consulting.com
offlinesurveys.com
Feel free to contact me by email for professional LimeSurvey support!

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DenisChenu
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5 years 3 weeks ago #193442 by DenisChenu

Replied by DenisChenu on topic SMTP - single session for multiple emails

Plugin :

1. get the mailer : github.com/LimeSurvey/LimeSurvey/blob/18...SenderToFrom.php#L39
2. Set it to keepalive $limeMailer->SMTPKeepAlive = true;

Assistance on LimeSurvey forum and LimeSurvey core development are on my free time.
I'm not a LimeSurvey GmbH member. - Professional support - Plugins, theme and development .
I don't answer to private message.

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