eQuality Technology uses Google Apps For Your Domain (GAFYD) also referred to as GoogleApps, which includes mail services. eQuality Technology is a Google Apps consultant and is happy to help you with your Email services.
Contents
Users
Access mail in your web browser by visiting http://mail.eQuality-Tech.com
HOWTO
My website needs a contact form
If you want to add email to your PHP application or website, then try https://github.com/PHPMailer/PHPMailer
My wiki won't send email
If your application already has email capability, but it won't send, then turn on the mail_log feature in php.ini and check that sendmail/postfix is installed on your system. You might start with sudo apt-get install mailutils. If on AWS or datacenter, you can set up as an internet site and be done. If you are behind a consumer broadband IP, you will probably need to setup a 'smarthosted' site and use (your own) IMAP credentials to send email through another provider.
I need a server to send email
You can setup Postfix to send as an Internet Site. And you can even use it to send mail through an external service like GMail (called 'smart hosting'). Once you do, you certainly need to add or reconfigure your domains SPF record in DNS. If you just want to use the MX records and A records to control who is valid, then "v=spf1 mx a -all" is the record that works. This wizard can help. Once you're done, you can check on things with
nslookup -query=mx
Tools
Issues
Users can be blocked for going over usage limits (messages per day, recipients per message, etc) https://support.google.com/a/answer/166852?hl=en