Magento 2.3 mail send issue

[visahardik]

Preconditions

1. Magento 2.3.1 or 2.2.8

Steps to reproduce

1. Sales > Orders > Open any one order.
2. Click on Send mail.
3. Register new customer.

Expected result

1. Mail should be send

Actual result

1. main.ERROR: Unable to send mail: Unknown error

Same env works for every mail like register, new order and any other with 2.2.7 or 2.3.0

[magento-engcom-team]

Hi @visahardik. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

• Summary of the issue
• Information on your environment
• Steps to reproduce
• Expected and actual results

Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento-engcom-team give me $VERSION instance

where $VERSION is version tags (starting from 2.2.0+) or develop branches (for example: 2.3-develop).
For more details, please, review the Magento Contributor Assistant documentation.

@visahardik do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[orlangur]

@visahardik are you using XAMPP with Linux or MacOS?

You need to debug further what is going wrong on your env, otherwise such issue looks pretty hard to reproduce and investigate by others.

[visahardik]

@visahardik are you using XAMPP with Linux or MacOS?

You need to debug further what is going wrong on your env, otherwise such issue looks pretty hard to reproduce and investigate by others.

I am using XAMPP with Windows 10. I tried to debug but does not give proper error TranString return files path but not give error.

[magento-engcom-team]

Hi @engcom-backlog-nazar. Thank you for working on this issue.
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HI @visahardik thank you for you report, i'm not able to reproduce following steps you described.
This is not a valid environment, please check https://devdocs.magento.com/guides/v2.3/install-gde/system-requirements-tech.html

[rvinothraj]

Hi All,
I am also facing same issue, mail functionality is not working, so i tried debug but cannot able to get respective error expect the following return message.

{"result":false,"message":"Error sending email. We can't process your request right now.","data":"Unable to send mail: Unknown error"}

Before 2.3 upgrade everything was working fine, but after upgrade only got issue because latest version had updates on Transport.php file, ....please try to help someone. Thanks in advance.

[itsazzad]

Same issue using docker

[pixmin]

Same issue here, order and invoice emails are not sent anymore after the 2.2.8 and 2.3.1 upgrade.

[orlangur]

@rvinothraj @itsazzad @pixmin this cannot be investigated without a proper debug on your side. Set a breakpoint at line where error is thrown to see what is causing an issue.

Is it correct that you're not using XAMPP?

[pixmin]

@orlangur Correct, not using XAMPP (on Debian / Apache)

I have no error message for the order / invoice process, but I'm now going to check if I can reproduce and get more information with the problems reported by @visahardik

[pixmin]

@orlangur Sorry but when trying to reproduce, I get no error:

On Magento 2.3.1, go in the back office: Sales > Orders and open an order
Click on "Send email", confirm
I do get the message "You sent the order email." but receive nothing and have no errors in any logs I can think of (console log from the browser, no error in any of the AJAX calls, nothing in any of the log files in var/log, and no error in the Apache logs).

If I switch to 2.3.0 on the very same environment, I get the email...

Would love to help debug this issue, but how?

Note: The issue is exactly the same with Magento 2.2.x (works in 2.2.7 and stopped working on 2.2.8)

[orlangur]

@pixmin,

Set a breakpoint at line where error is thrown to see what is causing an issue.

Please try this. And then check stack trace in runtime to see what is an underlying error.