I have a client who needs to send 600+ (his whole contact list) email every morning at once. My mail server is Ubuntu 14.04.1 LTS running postfix with dovecot. Now I'm interested in ideas how to handle this and what to watch out for. A few questions: Can this 600+ email at once crash my server? Can this mass email sending blacklist my server as a spam server? Is there max send mail number per minute/hour that I have to be aware?