When attempting to send mass messages, you may receive an error like "The value must be in the range 0...25 Only the Plesk administrator can adjust this setting."
Messages per hour
We make use of outbound spam protection by limiting the volume of emails that can be sent per hour on a per-account, per-domain, and per-subscription basis. We do not consider these fixed limits. They default to what we consider to be higher than average values to allow enough room for most companies and individuals to send messages without interruption by this protection system.
On shared/reseller hosting we configure the defaults as:
- Email Account: 50 messages per hour (that's almost 1 message every minute)
- Domain: 100 messages per hour
- Subscription: 200 messages per hour
We impose these limits for both your protection and ours. They prevent the server from being abused if a spammer should get hold of someone's email. A spammer would send at least a few messages every second -- very quickly reaching the messages / hour limit -- and additional messages beyond the limit would be blocked from sending. This ensures that your email account and domain do not end up on email block lists and similarly it ensures our server IP doesn't end up on block lists. It's a win for everyone.
If you are regularly sending more than these limits we'll increase the limit for you (simply open a ticket), however the increase must be reasonable for personal and small business use.
Bulk Email Sending
If you're sending more than, say, 200 messages per hour, this is considered bulk mail and you will need to use one of the following services to send that volume of mail:
- If a Mailing List: A mailing list service (works alongside your existing email hosting). Popular options include: MailChimp, ActiveCampaign, MailJet, or SendInBlue.
- If Transactional Emails: A transactional email sending service (works alongside your existing email hosting). Popular options include: Amazon SES, Mailgun, or Sendgrid.
- Your own VPS with dedicated mailing list software like phpList (works alongside your existing email hosting, OR you can switch your mail service to the VPS as well)
- A business-class mail service like our Exchange email hosting (moves your email service to Exchange servers)
With the introduction of CASL anti-spam legislation in Canada, sending out mass messages has *many* technicalities associated with it that must be followed very precisely. One such requirement is ensuring there's a very clear and as close to automated opt-out process as possible. MailChimp (and other similar services) provide all of these mechanisms for you.
Similarly, bulk mail services also handle tracking of bounce messages and open rates, all functionality that is exceptionally useful when sending mass mail which a standard email cannot supply.