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What does this mean?

If you have a mailman mailing list:
That has more than 5000, 500, 250 or 100 list members respectively, anything after your hourly email limit will most likely not be delivered. The server will automatically toss it in the garbage. This is because mailman does not throttle outbound email efficiently. Several factors can allow you to exceed 100, 250, and the 500, 5000 list member limit, like time of day, time at which the mailman list was sent, server load and other factors. However for easy numbers plan on list sizes no greater than your hourly email limit when using mailman.

If you have a php list mailing list:
You can have more than 5000, 500, 250 or 100 list members respectively. You can bypass the problem with trying to deliver more than 500, 250 or 100 emails to your list members by throttling the rate at which emails are sent. To see how this works, please see this thread:

Email rate throttle in php list

If you have a vBulletin forum script:
You can have more than 5000, 500, 250 or 100 forum members respectively. You can bypass the problem with trying to deliver more than 5000, 500, 250 or 100 emails to your forum members by throttling the rate at which emails are sent. To see how this works, please see this vBulletin Plugin:

Email rate throttle in vBulletin

Warning
If you have more than 1000 list members on a SHARED hosting package, we ask you to schedule your lists in "off peak" hours. Off peak is considered to start at 10 PM PST(1 AM EST) Your list should be completed by 5 AM PST (8 AM EST)

If you have a Cloud or Dedicated Server, feel free to send to your large email list at any time that works best for you.

If you have more than 5000 list members, you will need a Dedicated Server or Cloud Server. Please open a support ticket with us to check on availability of a dedicated server or simply order online at our main web site.

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