How email works?
SMTP (Simple Mail Transport Protocol) is a protocol governing electronic mail transmission and reception. It is used for sending email to and between mail servers (sending and receiving email messages).

Using email clients like: Outlook Express or Eudora etc. to send out email to your ISPs mail server--which collects them--put them in queue and then relay them to your recipients ISP mail server--for retrieval from their mailbox.

Mailbox - each mailbox is assigned a unique address ie: mymail@my_domaiin.com character string which identifies the user to whom the mail is to be sent.

Mailboxes normally reside on mail servers that are always connected to the Internet (otherwise mails can't be received), and mails are fetch from the remote mail servers using Post Office Protocol (POP3) by the user with their mail client.

Email in queue at your ISP mail server may takes just a few seconds to be delivered--if it is not overloaded--to a few minutes or even hours, and if the network is down or the recipients mail server does not want to accept your email for some reason like: busy or mailbox full--then your ISP or your own mail server will try to deliver again.

Many ISP (or your) mail servers can be programmed to make multiple attempt delivery of undelivered email, some up-to 250 times before returning them as undeliverable.

In many countries, local legislation requires ISP service operator to grant security service access to the user's correspondence--so, your emails are probably stored in your ISP's system for some time before being delivered.

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