1
WP Mail SMTP Paid version Pro
Backup connection takes over and resends when the primary mailer fails.
96feature score
WordPress SMTP & Email Delivery Plugins with Backup connection
Falls back to a second mailer if the main one fails. 7 of the 8 plugins we track include it.
2
Easy WP SMTP Paid version Basic
Secondary connection takes over and retries if the primary fails.
97feature score
3
FluentSMTP Included
Fallback connection is used when the default connection fails.
89feature score
4
Post SMTP Included
Fallback SMTP takes over when the primary fails; Pro adds more connections.
90feature score
5
SureMail Included
Connections for the same From email are tried in sequence until one succeeds.
81feature score
6
Solid Mail Included
Default connection plus 'Use Alternative Connections on Failure' retries via other connections.
40feature score
7
Site Mailer Partial
Falls back to native wp_mail if the Elementor service errors (v1.2.2); no second provider.
36feature score