What are the Mass Mailing Limits?

When sending mass mails through IONOS mail servers, limits apply to prevent abuse (SPAM). Depending on your product, the following limits apply:

Mail Basic and Mail Business

Maximum number of recipients per hour:

Age of the contract Number
0 - 7 days 50 recipients
8 - 14 days 100 recipients
15 - 30 days 400 recipients
> 30 days 5,000 recipients

Maximum number of recipients per email:

Contract Type Limit
Mail Basic 200 including CC and BCC
Mail Business 200 including CC and BCC

Microsoft Exchange 2013 and 2019

Maximum number of emails per minute via IMAP or POP:

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
Note

Microsoft Exchange 2013 can send a maximum of 10 emails per minute, regardless of the age of the contract.

Maximum number of recipients per day when sending via Outlook/Active Sync:

Age of the contract Microsoft Exchange 2019
0 - 7 days 1,500 recipients per day
8 - 14 days 3,000 recipients per day
15 - 30 days 12,000 recipients per day
> 30 days 16,000 recipients per day
Note

Microsoft Exchange 2013 can send emails to a maximum of 1,000 recipients per day, regardless of the age of the contract.

Maximum number of recipients per email sent:

Contract type number
Microsoft Exchange 2013 500 including CC and BCC (contact/mailing lists are counted as 1 recipient)
Microsoft Exchange 2019 500 including CC and BCC (contact/mailing lists are counted as 1 recipient)