Koliko treba mail serveru da primi/pošalje poruku?

Gleda se “delay” stavka u /var/log/maillog :
Delay= total time to deliver
A mail message can be delivered immediately, without ever having been queued, or it can be queued and retried over and over again until it either times out or succeeds. The delay= shows the total amount of time the message took to be delivered. This period of time starts when sendmail first receives the message and ends when the message is finally delivered or bounced.

Dobar link.