Please use the “Print” function at the bottom of the page to create a PDF.
When sending mass mails through IONOS mail servers, limits apply to prevent misuse (SPAM). Depending on your product, the following limits apply:
Mail Basic and Mail Business
The maximum number of emails you can send per hour depends on the following criteria:
- How long ago the email account was created
| AGE OF THE CONTRACT | MAIL BASIC AND MAIL BUSINESS |
|---|---|
| 0 - 7 Days | 50 Emails per hour |
| 8 - 14 Days | 100 Emails per hour |
| 15 - 30 Days | 400 Emails per hour |
| > 30 Days | 500 Emails per hour |
If the limits are exceeded, the following error message is displayed:
Message could not be sent. Error message from mail transport server:450 -
450-Requested mail action not taken: mailbox unavailable
450 Mail send limit exceeded.
Microsoft Exchange 2019
Maximum number of emails per minute through IMAP or POP3:
| Age of the Contract | Microsoft Exchange 2019 |
|---|---|
| 0 - 7 days | 1 email per minute |
| 8 - 14 days | 2 emails per minute |
| 15 - 30 days | 7 emails per minute |
| > 30 days | 10 emails per minute |
Maximum number of recipients per day when sending emails through Outlook/Active Sync:
| Age of the contract | Microsoft Exchange 2019 |
|---|---|
| 0 - 7 days | 1500 recipients per day |
| 8 - 14 days | 3000 recipients per day |
| 15 - 30 days | 12000 recipients per day |
| > 30 days | 16000 recipients per day |
Maximum number of recipients per email sent:
| Contract type | Number |
|---|---|
| Microsoft Exchange 2019 | 500 including CC and BCC (contact/mailing lists are counted as 1 recipient) |
Google Workspace
| Limitation | Number |
|---|---|
| Emails per day | 2000 |
| Automatic forwarding of emails | 10000 |
| Email filter for automatic forwarding | 20 |
| Recipients per email | 2000 |
| Recipients per message via SMTP (POP/IMAP users) or the Gmail API | 100 |
| Recipients per day | 10000 |
| External recipients per day | 3000 |
| Individual recipients per day | 3000 |