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
- Average sending volume
If the limits are exceeded, the following error message is displayed:Message could not be sent. Error message from mail transport server:
450-Requested mail action not taken: mailbox unavailable
450 Mail send limit exceeded.
Maximum number of recipients per day when sending emails through Outlook/Active Sync:
With Microsoft Exchange 2013, emails can be sent to a maximum of 1000 recipients per day regardless of the age of the contract.
Maximum number of recipients per email sent:
|Microsoft Exchange 2013||500 including CC and BCC (contact/mailing lists are counted as 1 recipient)|