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My Magento 2.3.4 doesn’t send emails. I’ve checked these options:

  1. Stores -> Configuration -> Advanced -> System Disable Email Communications is set to No.
  2. Navigate to Stores -> Configuration -> Sales -> Sales Emails under the General Settings tab, Asynchronous sending disabled.

However, despite these checks, the issue persists. In the log, I found the following error:

main.CRITICAL: Unable to send mail: Unknown error {"exception":"[object] (Magento\\Framework\\Exception\\MailException(code: 0): Unable to send mail: Unknown error at /home/customer/www/mysite/public_html/vendor/magento/module-email/Model/Transport.php:103, Zend\\Mail\\Transport\\Exception\\RuntimeException(code: 0): Unable to send mail: Unknown error at /home/customer/www/mysite/public_html/vendor/zendframework/zend-mail/src/Transport/Sendmail.php:305)"} []

My PHP version is 7.3.33 with SiteGround. The emails were working correctly until about 1-2 years ago.

UPDATE

LOGS:

main.WARNING: Broken reference: The element with the "customer" ID wasn't found. Verify the ID and try again. [] []

main.CRITICAL: Deprecated Functionality: Method ReflectionParameter::getClass() is deprecated in /home/customer/www/mysite/public_html/vendor/magento/framework/Code/Reader/ClassReader.php on line 36 {"report_id":"bbc7faab10cdb433fd895c751eca68f9aae15f45606dc465c9f86a4d7e5db962","exception":"[object] (Exception(code: 0): Deprecated Functionality: Method ReflectionParameter::getClass() is deprecated in /home/customer/www/mysite/public_html/vendor/magento/framework/Code/Reader/ClassReader.php on line 36 at /home/customer/www/mysite/public_html/vendor/magento/framework/App/ErrorHandler.php:61)"} []

MAIL SETTINGS MAIL SETTINGS

PHP VARIABLES ON WEBSERVER PHPVAR

If i use sendmail command through ssh the emails are sent.

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9
  • are you using server email functionality or any SMTP extensions?
    – Afzel Arshad
    Commented Jun 13 at 10:55
  • No, since I installed magento I simply set up the email template and that's it, without any particular extension. If I confused something I apologize and ask you to let me understand what I should check.
    – LoyckHope
    Commented Jun 13 at 13:54
  • because this is a fresh instance you need to install any SMTP module for your emails,
    – Afzel Arshad
    Commented Jun 13 at 15:03
  • Sorry maybe I didn't explain myself well, it's not a new installation, it's almost 7/8 years that it's been online, and everything was working fine, recently the emails stopped working without me making any changes to the settings.
    – LoyckHope
    Commented Jun 13 at 15:07
  • it's hard to find the reason why suddenly emails stopped working without actually debugging, The most common issue will be the change in the configuration from the third-party vendor side.
    – Afzel Arshad
    Commented Jun 13 at 15:11

1 Answer 1

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@LoyckHope

Hey, follow the below given steps,

  1. Admin Configuration ->Log in to the Magento Admin Panel. ->Navigate to Stores -> Configuration -> Advanced -> System -> Mail Sending Settings.
  2. Verify Cron Jobs
  3. Check SMTP Configuration
  4. check Log files: var/log/system.log var/log/exception.log

Thank You!

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1
  • Thanks for the reply, the first two points seem to be okay, now I will update the question with the errors that are in the logs you mentioned. I didn't modifyed nothing since the first time I installed magento and builded the website
    – LoyckHope
    Commented Jun 13 at 14:01

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