Magento 2.3.4 here.

I can only send out 1 order email per admin session from the admin panel. Then it fails with no error message.

If I log out and in again I can send another email. But just one.

Anyone has any idea how to fix that?


2 Answers 2


any firewalls/security layers available?

  • Thanks. Nothing special that I know of. I have the Simplify Bulk Order Processing (Magento 2) by XTENTO extension installed and sending transactional emails works flawlessly using the extension. Commented Mar 2, 2020 at 21:38

The problem was caused by the varnish cache.

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