Are you trying to block baiduspider from your html email? 

I think you should review the commented out lines. Very old school, but you may want to just print your conf file and line up curly braces. Perhaps copy the conf file, delete commented lines, and then see if it makes sense.  It looks to me like the conf file can't be parsed due to mismatches.

  Original Message  
From: xstation
Sent: Friday, December 16, 2016 12:45 AM
To: nginx@nginx.org
Reply To: nginx@nginx.org
Subject: Re: nginx.conf

Here is full conf

user www-data;
worker_processes 4;
pid /run/nginx.pid;

events {
worker_connections 768;
# multi_accept on;
}

http {


##
# Basic Settings
##

sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
# server_tokens off;

# server_names_hash_bucket_size 64;
# server_name_in_redirect off;

include /etc/nginx/mime.types;
default_type application/octet-stream;



##
# SSL Settings
##


ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
ssl_prefer_server_ciphers on;

##
# Logging Settings
##

access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;

##
# Gzip Settings
##

gzip on;
gzip_disable "msie6";

# gzip_vary on;

ssl_prefer_server_ciphers on;

##
# Logging Settings
##

access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;

##
# Gzip Settings
##

gzip on;
gzip_disable "msie6";

# gzip_vary on;
# gzip_proxied any;
# gzip_comp_level 6;
# gzip_buffers 16 8k;
# gzip_http_version 1.1;
# gzip_types text/plain text/css application/json
application/javascript text/xml application/xml application/xml+rss
text/javascript;

##
# Virtual Host Configs
##

include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;
}


#mail {
# # See sample authentication script at:
# # http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
#
# # auth_http localhost/auth.php;
# # pop3_capabilities "TOP" "USER";
# # imap_capabilities "IMAP4rev1" "UIDPLUS";
#
# server {
# listen localhost:110;
# protocol pop3;
# proxy on;

($http_user_agent ~ "^Baiduspider") {
return 403;
}

# }
#
# server {
# listen localhost:143;
# # auth_http localhost/auth.php;
# # pop3_capabilities "TOP" "USER";
# # imap_capabilities "IMAP4rev1" "UIDPLUS";
#
# server {
# listen localhost:110;
# protocol pop3;
# proxy on;


}

# }
#
# server {
# listen localhost:143;
# protocol imap;
# proxy on;
# }
#}

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,271581,271598#msg-271598

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