Admins Handbook

In a command prompt:
wmic useraccount get name,sid

Due to an error in proftpd, you might need an virtual group.

/etc/proftpd/proftpd.conf:

GroupOwner www-data
Umask 002 003

AllowOverwrite on
AuthGroupFile /etc/proftpd/ftpd.group

/etc/proftpd/ftpd.group
www-data:x:33:testuser
Same ID and name as the local user.

/etc/nginx/ssl
openssl req -new -newkey rsa:2048 -nodes -keyout *.mydomain.com.key -out *.mydomain.com.csr

Inside config:
/etc/nginx/sites-available/default

ssl on;
ssl_certificate /etc/nginx/ssl/*.mydomain.com.crt;
ssl_certificate_key /etc/nginx/ssl/*.mydomain.com.key;
ssl_trusted_certificate /etc/nginx/ssl/chain.crt;
ssl_dhparam /etc/nginx/ssl/dhparam.pem;

chain.crt:
AlphaSSL SHA-256 R1 Intermediate Certificates (DER64)

dhparam.pem:
openssl dhparam -out dhparam.pem 4096

Office 365 sends emails from a lot of mailservers. retrys are often from a new IP.
Then you have delays of 5 min + 5 min etc…

Office 365 uses this IP’s:
https://technet.microsoft.com/en-us/library/dn163583

In your Mailscanner, you can Whitelist Office 365 Exchange IP’s by adding them to this:
/etc/sqlgrey/clients_ip_whitelist.local

OR
/etc/sqlgrey/clients_fqdn_whitelist.local
*.messageslabs.com
outbound.protection.outlook.com
*.outbound.protection.outlook.com
*.microsoftonline.com
*.hotmail.com

/etc/init.d/sqlgrey restart