Many ISPs mail servers makes multiple attempt to
deliver undelivered email up-to 250 times for days,
before bouncing them back to you as undeliverable.

email recipients don't get my email messages immediately?

Why is it that some of my email recipients
don't get my email messages immediately?

After broadcasting your emails, your ISPs mail server will collects and put them in queue (store them) for delivery to your recipients mailbox via your ISPs mail server for retrieval by your recipients.

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

Email in queue at your ISPs mail server may takes just a few seconds to be delivered--if it is not overloaded--to hours, and if the network is down or the recipients mail server does not want to accept your email like; busy or mailbox full, etc.

Many ISPs mail servers (or your mail server) are programmed to make multiple attempt delivery of undelivered email, some up-to 250 times--within hours or days, before bouncing them back to you as undeliverable.

Using your PCs as a mail server can speed-up the delivery process because emails are sent directly to the recipient mailbox via their ISPs mail server.
See: PC Mail Server

MailBox? Each mailbox is assigned a unique address ie: mymail@mydomain.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 and mails are retrieved by the user mail client from the remote mail servers using (POP3) Post Office Protocol

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