pfSense email notification when fallback WAN connection goes down

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I have two WAN connection. The first WAN connection connects via FTTH modem. The second connection connects via 4G LTE CPE modem. I have configured fallback and load balanced dual WAN connection on my pfSense box. However, once in while the Internet connection either one of the WAN goes down. How can I tell pfSense to send an email notification when fallback (or any) WAN connection goes down? How to configure pfSense email notification when an alert happens?

Postfix Configure Multiple ISP Client SMTP Authentication

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How do I support multiple ISP accounts in the Postfix SMTP client (smarthost) for relaying email? For example:

[a] must be relay via
[b] must be relay via
[c] must relay all my default email via

Postfix Configure Client SMTP Authentication ( Smarthost Authentication )

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My ISP requires that mail from my dynamic IP to our small business email addresses uses their outgoing SMTP servers. This is probably done to reduce abuse and spam but now I’m not able to send email and local Postfix log file displays authentication failure message. How do I relay mail through my mail ISP servers using Postfix SMTP under Linux / UNIX like operating systems?