Magento2: "From Header set twice" when sending an email

[RishabhRkRai]

Preconditions

1. I use v2.1.1 of Magento and MySQL 5.6.x
2. I make a custom module which send an email to person more like subscription, when new varients of an item is come.

Steps to reproduce

1. Make a custom module, which store email and product id in a custom database.
2. Whenever something new new book edition of that product id will came. It checks for that custom table and send email to that saved email id.
3. I use Magento "TransportBuilder" to send mails.

Expected result

1. Emails have been send to all the saved mails in custom table without any error.

Actual result

1. My category page have no product for the product id belongs to.
2. Email for the first data found send but for the rest it gives an error in which throw in exception.log.
3. There is an log in exception.log
   main.CRITICAL: exception 'Zend_Mail_Exception' with message 'From Header set twice' in /../../../../vendor/magento/zendframework1/library/Zend/Mail.php:680

[RishabhRkRai]

Any update on this.

[toshz]

Same issue here. Trying to send two emails. One for order confirmation and the other is for a specific type of product from the same order. I get this error:
==> var/log/system.log <==
[2017-09-29 11:33:11] main.ERROR: From Header set twice [] []

Magento CE 2.1.5
PHP 5.6

[maheshWebkul721]

@toshz if you need to fix in your custom module then you can read this blog for the solution.
https://webkul.com/blog/magento2-email-header-set-twice-error-custom-module/

[magento-engcom-team]

@RishabhRkRai, thank you for your report.
We were not able to reproduce this issue by following the steps you provided. If you'd like to update it, please reopen the issue.
We tested the issue on 2.1.9

[tomlutzenberger]

Had the same issue sending only 1 mail after a new customer registered.
The problem was, that I created a new transportBuilder using the ObjectManager instead of DI.
Don't do that
Make use of proper dependency injection.

[ihor-sviziev]

It seems to me that it's a known issue, but it's hard to reproduce it.

Looks like this issue duplicating #14952.

Currently we have Pull Request https://github.com/magento/magento2/pull/16461 that should fix this issue, but it's not accepted because it's not clear how to fix this issue in correct way.

[stephan-cream]

I found out how to reproduce this.
When sending multiple mails in the same process.
A cronjob would be a good example.
Another good example would be a mass action like the one provided by Mageworx's module-ordersgrid module to resend order emails, invoice emails and shipment emails.

The main cause is that a singleton is being used in the following files:

• vendor/magento/framework/Mail/Template/TransportBuilder.php
• vendor/magento/framework/Mail/Template/TransportBuilderByStore.php
  This singleton is the message singleton (an instance of Magento\Framework\Mail\MessageInterface).
  Zend_Mail gives an error when the header is set twice, subject, date, recipients, etc.
  Since a singleton is being used, once one of them is sent, during the next mail attempt it will try to configure the above headers and will give an error message.
  This is because the singleton instance is never properly 'cleared/reset'.

There is a reset function that is called on the TransportBuilder but a simple mistake is made here.
Instead of clearing the message singleton's headers / variables it is created anew with the following code: $this->message = $this->objectManager->create(\Magento\Framework\Mail\Message::class);.
However the singleton that was loaded in TransportBuilderByStore is not reset with this, only the one within TransportBuilder.
As such the from header and variable is still set.
I believe you should replace the above code with the following.
$this->message->clearDate();
$this->message->clearFrom();
$this->message->clearMessageId();
$this->message->clearRecipients();
$this->message->clearReplyTo();
$this->message->clearReturnPath();
$this->message->clearSubject();

This fix works for me at least.
If i am missing something please let me know.

[ihor-sviziev]

Hi @stephan-cream as I said before - this issue duplicating https://github.com/magento/magento2/issues/14952.
We have potential fix in https://github.com/magento/magento2/pull/16461 (but as it's not merged yet - we might change implementation).

I just updated labels and I'll keet this issue open

[ghost]

Duplicate of #14952

[jaykobi]

I have the same problem but the solution from @stephan-cream did not work for me. To make magento send my invoice mails again, until the official fix is published, I changed vendor\magento\framework\Mail\Template\TransportBuilderByStore

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;
    }

[loekderooij]

It is easier to define the injected transport object as non singleton. You can do this by defining your injected object in di.xml and setting the attribute 'shared' to 'false'. For instance, I created a script where I needed to send multiple order mails. Adding the following resolve my problem:

<type name="\Magento\Sales\Model\Order\Email\SenderBuilder">
        <arguments>
            <argument name="transportBuilder" xsi:type="object" shared="false">Magento\Framework\Mail\Template\TransportBuilder</argument>
            <argument name="transportBuilderByStore" xsi:type="object" shared="false">Magento\Framework\Mail\Template\TransportBuilderByStore</argument>
        </arguments>
    </type>

[ihor-sviziev]

@LuckyLoek unfortunately it will not be enough because they both contains "message" object that should be shared.

[gwharton]

Fixed in 2.2-develop
https://github.com/magento/magento2/commit/9a7c9e553b1c9814907105388bffc2e8a91353a5#diff-dfb3ee5a7f863458afea75f5524cd2e5

[hostep]

@gwharton: just ran into this problem on Magento 2.2.5 shop (without amazon modules), and can not confirm that 9a7c9e5 fixes the "From Header set twice" problem. In fact, it makes the email system even more unstable, by causing the From email address to be incorrect.
Also when async sending of emails is enabled, the order emails weren't getting marked as sent anymore, so they got send every single minute again by the cronjob in our case.

By then applying your fix https://github.com/magento/magento2/pull/18472/ as well on top of this, we get a much more stable email system, no more "From Header set twice" problems, also no incorrect From email addresses and async sending now marks emails as being sent.

Just wanted to add this extra info in here in case anybody else ran against this.

Big thanks for the fix!

[magento-engcom-team]

Hi @RishabhRkRai. Thank you for your report.
The issue has been fixed in magento/magento2#18471 by @gwharton in 2.3-develop branch
Related commit(s):

• ad50297e7bf4ea39db62f0969579a1ca8eb5f1a3
• e16ff74e4f5f24a4a2530b6aced6ef50032515e0
• 621d2cfeaf8e0a15e592cdc001c856385b3cbd83
• b6f9e48289119117df230b6578ac9ff3d69e4996
• 0dc85785e522e2be8c72dfeaee7e9f5054195034
• 122019c953037df74ef97245a42b274eae2e6639
• 193c6c2f6facf7276c1c8858d29ea3b847062ef5
• bd0aa57cc837918335015d051f08cf380dc186d0
• 523b0464966f81f1f01aa13073092bfddf363219
• 424929fe9aee1005601cc2c9c7ad0090741be723
• c32ca7a0d58cbc57276349b26eb5ecd38451fd2d
• e39ce7a3f2a7e6ee134cff9a097b7321756c32cf
• 99621b32f8c7d3d12f83db7e67f5f1c1ef3e7f31
• f171c9d6ab035439ffb6374ec14dd8d51123dcd2

The fix will be available with the upcoming 2.3.1 release.

[stephan-cream]

@magento-engcom-team give me 2.2.7-develop instance

[magento-engcom-team]

Hi @stephan-cream. Thank you for your request. I'm working on Magento 2.2.7-develop instance for you

[gwharton]

@stephan-cream I think you will find this is still broken in 2.2.7.

I'm hoping that #18472 will be merged soon in time for 2.2.8 which resolves this issue.

[stephan-cream]

I know, hence i was trying to get a clean install to make a screencapture.
It is broken because of vendor/magento/framework/Mail/Template/TransportBuilder.php.
Since in the public function reset() the message singleton is replaced with a new instance (non-singleton) the From email/name which is set in vendor/magento/framework/Mail/Template/TransportBuilderByStore.php will not be available in this new non-singleton which is eventually used to send the email.
Like i previously stated, replacing a singleton with a new instance won't fix this issue, in fact now emails can't be sent at all because there is no 'From' available.

[gwharton]

Yeah, If you apply #18472, it gets rid of the use of TransportBuilderByStore altogether.

[crankycyclops]

@gwharton, I'm really confused, because I'm looking at my 2.2.7 instance (installed via composer), and when I go through the files in the diff manually, I see that all the changes in #18472 seem to have already been merged. Yet I still get the "From Header sent twice" error.

[gwharton]

Yes. Im also confused. The source code for 2.2.7 on github does NOT have 18472 merged. I just checked.

[crankycyclops]

@gwharton, that is indeed very strange. I also went back to browse the files in the 2.2.7 Github release, and I can see that the changes weren't applied like you said. Yet they are in the 2.2.7 version I installed via composer.

At any rate, after verifying that those changes are a part of my code, I still get the "From Header set twice" error, so it looks like I'll have to dig into Magento core some more to see what's up. Like others, this bug seems to occur for me when I try to send more than one email in the same process.

EDIT: Some digging reveals that the issue I'm having might be due to a bug in my own module's code. That being said, @skymeissner's solution (https://github.com/magento/magento2/issues/7739#issuecomment-417314609) seemed to make my mail system more robust. Whereas the bug in my code prevented all emails in the process from being sent out, applying his fix allowed at least the emails not related to my own code to go out. Thought that might be worth mentioning, as it may be worth rolling it into the official Magento core. For now, I'm just going to maintain my own patch for it that I'll apply whenever I update via composer.

[gwharton]

Just be aware that when you get the error saying From set twice, this means that the $message object that Magento is using to formulate an email has already been used for a previous email and still has content in it. In the #7739 fix, the from address is cleared before being reset, but what about the other fields. Sure the body and subject will be rewritten as the new email is formed, but what if for example the previous user of the $message object had a Bcc or cc set. Will this be cleared also? Could you inadvertently release sensitive info. This may be the preferred behaviour when the second email is a copy of the first, for example to admin, but what if the second email is unrelated to the first.

There is some logic inside the Transport Builder class in the getTransport and reset functions where the "reusing" of message objects happens. Would be worth checking that out and making sure its doing exactly what you think it is doing.

[ihor-sviziev]

FYI This issue was fixed in 2.2-develop branch and planned to be included to 2.2.9 release
https://github.com/magento/magento2/pull/18472

[tuyennn]

@gwharton Is there anyway to approach the problem in another way implementation while sending multiple emails because seem message still used from subject etc from previous mail?

[gwharton]

Someone from Magento will need to pick this up and look at what needs to be done moving forward.