nginx configuration for Mailpile

mailpile.conf

server { 
	listen 443 ssl http2;
	listen [::]443 ssl http2;
	server_name sub.yourdomain.com;

	ssl_certificate /etc/ssl/sub.yourdomain.cer;
	ssl_certificate_key /etc/ssl/private/sub.yourdomain.key;

	# TLS protocol and ciphers
	ssl_protocols TLSv1.2 TLSv1.3;
	ssl_ciphers "ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-CHACHA20-POLY1305:AES-256-GCM-SHA384:EECDH+AESGCM:EDH+AESGCM";
	ssl_ecdh_curve secp384r1;
	ssl_dhparam /etc/ssl/dhparam.pem; # openssl dhparam -out /etc/ssl/dhparam.pem 4096
	ssl_prefer_server_ciphers on;

	# TLS session
	ssl_session_timeout 5m;
	ssl_session_cache shared:SSL:1m;
	ssl_session_tickets off;

	# Security headers
	add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
	add_header X-Xss-Protection "1; mode=block" always;
	add_header Referrer-Policy "no-referrer-when-downgrade" always;
	add_header X-Frame-Options "SAMEORIGIN" always;
	add_header X-Content-Type-Options "nosniff" always;

	location / {
 		client_max_body_size 50M;
		proxy_set_header Connection "";
		proxy_set_header Host $host;
		proxy_set_header X-Real-IP $remote_addr;
		proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
		proxy_set_header X-Forwarded-Proto $scheme;
		proxy_set_header X-Frame-Options SAMEORIGIN;
		proxy_buffers 256 16k;
		proxy_buffer_size 16k;
		proxy_read_timeout 600s;
		proxy_http_version 1.1;
		proxy_pass http://localhost:33411;
	}
}