Gsyfuy

I Installed magento 2 on my vps server
and configured store email like this

but order confitmation email will not send to the customers
what should I do , should I setup cron as some link recomended to do this
or should I configure my server like this link
what is the problem?

If you have properly configured Magento 2 mailing systems, you may need to check below point:

1. Got to Stores -> Configuration -> Advanced -> System
   

Under Mail Sending Settings make sure Disable Email Communications is set to No. Also verify your Host and Port fields if you are using any external mailing server.

2. Got to Stores -> Configuration -> Sales -> Sales Emails
   

Under General Settings tab, choose Asynchronous sending to Disable

Under Order tab Enabled to Yes

Now clear/refresh your cache.

Hope this helps you. This solution is tested with Magento 2.1.0

This will work.

The transportbuilderbystore class has already been deprecated in 2.3
and soon will be in 2.2.

Fixed in Magento 2.2.7.

Fix:
vendor/magento/module-sales/Model/Order/Email/SenderBuilder.php

replace

    $this->transportBuilderByStore->setFromByStore(

        $this->identityContainer->getEmailIdentity(),

        $this->identityContainer->getStore()->getId()

    );

with

    $this->transportBuilder->setFrom(

        $this->identityContainer->getEmailIdentity(), 

        $this->identityContainer->getStore()->getId()

    ); 

vendor/magento/framework/Mail/Template/TransportBuilder.php

replace

/**

 * Set mail from address

 *

 * @param string|array $from

 * @return $this

 */

public function setFrom($from)

{

    $result = $this->_senderResolver->resolve($from);

    $this->message->setFrom($result['email'], $result['name']);

    return $this;

}

with

/**

 * Set mail from address

 *

 * @param string|array $from

 * @return $this

 */

public function setFrom($from, $store = null)

{

    $result = $this->_senderResolver->resolve($from, $store);

    $this->message->setFrom($result['email'], $result['name']);

    return $this;

}

and just like that we do not need the TransportBuilderByStore anymore and it works as expected.

I'm having a similar issue with 2.2.5 randomly. All other emails send, just not sales emails. Would the TransportBuilderByStore issue effect me as well?

I had the same issue and found that the actual issue was caused because of "from" header. It was being set twice by some reason. Please update below file to get resolve this issue:

vendormagentoframeworkMailTemplateTransportBuilderByStore

public function setFromByStore($from, $store)

{

    $result = $this->senderResolver->resolve($from, $store);

    $this->message->setFrom($result['email'], $result['name']);



    return $this;

}

To

public function setFromByStore($from, $store)

{

    $result = $this->senderResolver->resolve($from, $store);



    if ($this->message->getFrom()) {

        $this->message->clearFrom();

    }



    $this->message->setFrom($result['email'], $result['name']);



    return $this;

}