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Example code of metarush/email-fallback

Informations about the package email-fallback

metarush/email-fallback

Send email via SMTP host, if it fails, fallback/failover to another SMTP host. Round-robin mode also available to distribute the load to all SMTP hosts.

Note: This library uses PHPMailer.

Install

Install via composer as metarush/email-fallback

Usage

Define your SMTP servers. You can add as many as you want.

The fallback servers will be used in the order they are defined. You must start the array key with 0 then increment by 1.

Initialize library:

Important: You must use the following method to send email with fallback:

SMTP server selector

If you want to send using a different server, input the server key in the parameter:

This is useful if server 0 didn't fail but the email is slow to arrive. E.g., On a "forgot password" UI, users can get the email faster if you create a "try again" UI then use an alternative server to send the email again.

Note:

The fallback can go back from the start. If you defined 3 servers (0, 1, and 2) and you selected server 2 to send the email, it can fallback to server 0 then 1. If you enter a key that does not exist in the config, 0 will be used.

If all servers fail, an exception EmailFallback\Exception will be thrown by sendEmailFallback().

Round-robin mode

Use round-robin mode to distribute the load to all SMTP hosts.

To enable round-robin mode, you must use a storage driver to track the last server used to send email.

Available drivers and their config:

files

memcached

Note: Only single server/non-distriubuted memcached is supported at the moment.

redis

Note: Use memcached or redis if available as files is not recommended for heavy usage.

After selecting a driver, set the following in the builder, before the ->build(); method:

All versions of email-fallback with dependencies

PHP Build Version
Package Version
Requires php Version >=7.1
phpmailer/phpmailer Version ^6.0
phpfastcache/phpfastcache Version ^7.0
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