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4.5.4. Mail server limits
The limits are the same for all users and cannot be changed.
Restrictions per IP address:
- Number of IMAP connections — no more than 40 simultaneously.
- Number of SMTP connections — not more than 3000 per minute.
- A maximum of 3000 messages can be sent per minute or a single message can be sent to a maximum of 3000 simultaneous recipients (including copies and hidden copies).
- If the limit is exceeded, the error "450 4.7.1 Error: too many recipients from IP" will occur.
- The restriction does not apply to WebMail.Online and WebMail classic.