What are the Mass Mailing Limits?

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