Error in exception handler: Expected response code 354 but got code "421", with message "421-4.3.0 Temporary System Problem. Try again later (10). For more information,
421-4.3.0 go to
421 4.3.0  https://support.google.com/a/answer/3221692 kz11-20020a170902f9cb00b001eab3ba79f2sm10708087plb.35 - gsmtp
" in /var/www/triptio.net/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php:383