I just found that Cimy Swift SMTP is not working while using it in conjuction with WooCommerce.
General WordPress emails are working, but emails generated from WooCommerce orders are not… And while searching why, I found messages like these on the Apache error log:
PHP Warning: fopen(): Filename cannot be empty in /my-path/wp-content/plugins/cimy-swift-smtp/Swift/lib/classes/Swift/ByteStream/FileByteStream.php on line 125, referer: http://www.example.com/checkout-page
After disabling Cimy Swift SMTP (and before activated it) all runs fine again.
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