There is a 500 outgoing email hourly limit per domain. This limit is also applied towards Mailman. If you send over this amount in any hour, most of the e-mails will bounce back with an undeliverable error. If this occurs, it will then take some time for your account to be able to send again so we recommend waiting at least 1 hour after this issue occurs to begin sending email again.
Many of our servers have a limit of 30 POP3/IMAP checks per hour per each user's connecting IP address. If you go over this you're likely to get a wrong password error message or an error stating "login incorrect". If this occurs, please wait an hour and it will automatically unblock you. To prevent this from happening again, please make sure to disable auto checking or at least set it to something higher such as once every 10 minutes.
Any mailing list larger than 5,000 addresses will require a dedicated server or VPS hosting solution from us. Note: Dividing one large list into smaller lists to get below this limit is not allowed.
There is also a limit to the number of Mailman mailing lists permitted as follows (NOTE: This does not apply to other mailing list programs such as PHPList. This only applies to Mailman.)
- Shared lower than aluminium: 20 Mailman mailing lists
- Shared between aluminium and business: 25 Mailman mailing lists
- Business package: 50 Mailman mailing lists
- Reseller and Dedicated packages: Unlimited number of Mailman mailing lists