Hello,
I am experiencing an issue with file uploads through Roundcube.
When I log in with the root account and use the URL
https://server.host.online/roundcube, I can upload large attachments (over 400KB) without any problem.
However, when regular email users log in through
https://mail.website.com.br, they cannot upload attachments larger than approximately 400KB. The upload fails immediately.
Both domains (server.host.online and mail.website.com.br) resolve to the same IP address. No external proxy (such as Cloudflare) is used.
The PHP configuration (upload_max_filesize, post_max_size) and Postfix (message_size_limit) are properly set to allow large files.
Nginx configuration also has client_max_body_size correctly configured for both HTTP and HTTPS.
Roundcube configuration (config.inc.php) does not have any limits set for upload size.
Thank you very much for your help!