A lot of (the good ones at least) hardware and software give you the ability to send notifications via email when scheduled too or a warning/error occurs. Without having to build and maintain your own mail server, you can use the Google SMTP server as your sending mail server.
You will also have the option of having Google store and index the emails you send, so all your sent emails will be searchable and backed-up on Gmail. If you elect to use your Gmail or Google Apps account for your incoming email as well, you'll have all your email in one convenient place. Also, since Google's SMTP server does not use Port 25, you'll reduce the probability that an ISP might block your email or flag it as SPAM.
Table from https://support.google.com/a/answer/176600?hl=en:
Server: smtp.gmail.com Port: 465 Username: Your Gmail or Google Apps email address Password: Your Gmail or Google Apps email password TLS/SSL required: Yes Authentication: Yes Security: SSL
The following is also a working combination:
Security: TLS Port: 587
Copies of outgoing emails are stored in the Gmail/Google Apps 'Sent folder'.
- Log into your Gmail or Google Apps email
- Click on "Settings" then on the "Forwarding/IMAP" tab
- Scroll down to the "IMAP Access" section. IMAP must be enabled in order for emails to be properly copied to your sent folder.
NOTE: Google rewrites the 'From' address emails to the default 'Send' email address in your Gmail/Google Apps account settings. To fix this, go to the "Accounts" tab and make another account the "default" Gmail/Google Apps account.
Example email details:
Test email from pfSense using the Google SMTP Server:
There is a limit of 2000 emails per day. Plenty.
CyberPower UPS PowerPanel - to let me know when the power goes out at home:
napp-it which is set to notify of disk failures and daily/weekly/monthly status:
Ubiquiti UniFi Controller which monitors my wireless access points: