How to make the transactional email being sent asynchronously or synchronously?

dmitrii_fediuk (Dmitrii Fediuk) May 6, 2016, 4:19am 1

Open the backend «Stores» → «Configuration» page.

Go to the «Sales» → «Sales Emails» section.
Locate the «General Settings» → «Asynchronous sending» option and set it to the proper value («Yes» or «No»).

The default value is «No»:
https://github.com/magento/magento2/blob/135f967/app/code/Magento/Sales/etc/config.xml#L30-L30

How is it used:

https://github.com/magento/magento2/blob/135f967/app/code/Magento/Sales/Model/Order/Email/Sender/OrderSender.php#L82-L101

https://github.com/magento/magento2/blob/135f967/app/code/Magento/Sales/Model/Order/Email/Sender/InvoiceSender.php#L84-L103

How does email scheduling work in cron job?

How is a confirmation email sent on an order placement?

How are the «send_email» (setSendEmail, getSendEmail) / «email_sent» (setEmailSent, getEmailSent) flags used for an order?

dmitrii_fediuk (Dmitrii Fediuk) May 6, 2016, 1:00pm 2

See also:

How is a confirmation email sent on an order placement?

dmitrii_fediuk (Dmitrii Fediuk) Split this topic June 25, 2017, 4:40pm 3

A post was split to a new topic: «How " * - if $forceSyncMode parameter is set to TRUE" is set? Where?»

dmitrii_fediuk (Dmitrii Fediuk) June 25, 2017, 4:42pm 4

The asynchronous email sending solves the problems like this:

In my production instance calls like $mailer->send(); takes around 40 to 60 seconds.
php - Send asynchronous emails in Magento 1.6 - Stack Overflow

dmitrii_fediuk (Dmitrii Fediuk) June 25, 2017, 5:02pm 5

Please note that the asynchronous email sending does not work correctly for non-English stores:

https://github.com/magento/magento2/issues/6511

dmitrii_fediuk (Dmitrii Fediuk) July 20, 2017, 1:49pm 6

How are the send_email (setSendEmail, getSendEmail) / email_sent (setEmailSent, getEmailSent) flags used for an order?