1. Limits

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
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

• Hatchling package: 20 Mailman mailing lists
• Baby package: 25 Mailman mailing lists
• Business package: 50 Mailman mailing lists
• Reseller and Dedicated packages: Unlimited number of Mailman mailing lists
2. Mailing Lists Rules

0. Any time you're sending a message no matter how large your e-mail list is you
must throttle it. We recommend you throttle it to at the very least sending 1 email
every 8 seconds. (Sending 1 every 8 seconds would send 450 emails within 1
hour, keeping you below the 500 outgoing email limit.) If the mailing list software
you're using does not allow you to throttle you must switch to an application or
script that will. We recommend PHPList, which can be found in your CPanel,
under Quickinstall.
IMPORTANT: If you do not throttle and you try sending 500 emails, the server will
try sending all 500 in 1 second which is not possible on our shared servers. This
will cause a very high load on the server and the entire server will be sluggish,
potentially affecting your sites and service, until this sending process is
completed. It is our job to keep the server up and running without being sluggish
or experiencing issues. Anyone who causes the server's load to go high will be
suspended and the process will be terminated. If you choose not to throttle, you
will most likely be suspended for crashing the server.

1. Any mailing list over 900 email addresses is only allowed to be sent to during offpeak times to prevent high server loads. Off peak times qualify as all day
Saturday and Sunday, and 1AM - 8AM Eastern Standard Time, Monday through

2. The list must be a Double Opt-In list. This means a user has subscribed for a
newsletter or other email marketing messages by explicitly requesting it and
confirming the email address to be their own. Confirmation is usually done by
responding to a notification/confirmation email sent to the email address the end
user specified. The double opt-in method eliminates the chance of abuse where
somebody submits someone else's email address without their knowledge and
against their will. You will not be permitted to mail any mailing list that you were
given or purchased. In doing so, this will also be considered spamming and may
result in termination of the offending account.
Email Scripts must be able to handle and document all information from a double
opt-in list. This includes recording the sign-up IP address and date/time, double
opt-in verification IP address and date/time, processing opt-outs (via web or
email), and list removal on bounce backs. All opt-outs or bounce back removals
must be handled in a timely manner, and outbound mail must be throttled on
shared packages to a maximum of five hundred (500) emails per hour. If your
account is found to be using a script that does not meet these requirements,
Zinglo reserves the right to suspend, terminate, or deactivate your script or

3. Any unsolicited e-mail being sent will result in suspension or termination of the
offending account. We take a zero tolerance stance against sending of unsolicited
e-mail and other forms of spam.

4. Any mailling list MUST comply with all guidelines set forth by the United States
government. These can be found at:

5. No direct SMTP mailers are allowed. An example of this would be a Darkmailer or
The Bat!. Any mail should be sent through the local mail server/MTA for further
delivery by the server and not done directly by scripts.