> so not sure if some other mail was bounced SMTP is designed to be resilient to outages. The sending MTA is supposed to queue messages if it can't reach the d

> so not sure if some other mail was bounced SMTP is designed to be resilient to outages. The sending MTA is supposed to queue messages if it can't reach the destination MTA. It should only bounce them after a significant outage (days, typically). https://www.rfc-editor.org/rfc/rfc5321#section-4.5.4 https://www.rfc-editor.org/rfc/rfc5321#section-4.5.4