Contact Form 7 can't send attachment more than 6MB to email

问题

Attachment is uploaded into server. But, unable to send attachment using contact form to email if file is larger than 6MB. Ajax is loading. I encounter the following errors:

 EMAIL DELIVERY ERROR: the plugin WP Mail SMTP v1.4.1 logged this error during the last time it tried to send an email:

Mailer: Gmail

Request Entity Too Large

Request Entity Too Large Error 413

Here is my setting:

I have increased the following in php.ini:

      
upload_max_filesize = 512M
post_max_size=512M
max_execution_time=600
max_input_time=600
memory_limit=1024M

CF7 file limit: 20MB

I still can't send file to email if more than 6MB. Thanks a lot.

来源：https://stackoverflow.com/questions/54900130/contact-form-7-cant-send-attachment-more-than-6mb-to-email