How to resolve the 'too frequently sending' bounce error - Alibaba Mail

If your emails bounce with a "too frequently sending" error, the cause is usually exceeding sending limits or using a weak password.

Symptoms

An email sent from Alibaba Mail is not delivered, and one of the following error messages is returned:

454 Transient reject by behaviour spamANTISPAM_BAT[01201311R1468S45301xxxxx, a0330021xxxxx]: too frequently sending
454 Transient reject by behaviour spam at Rcpt State(Connection IP address:x.x.x.x)ANTISPAM_BAT[01201311R9368Sxxxxx, xxxx]: too frequently sendingCONTINUE
554 Reject by behaviour spamANTISPAM_BAT[01201311R196xxxxx, c01a1xxxxx]: too frequently sending
554 Reject by behaviour spam at Rcpt State(Connection IP address:x.x.x.x)ANTISPAM_BAT[01201311R1568Sxxxxx, xxxx]: too frequently sendingCONTINUE

Causes

This error can occur for the following reasons:

1. The sender's email frequency or volume exceeds Alibaba Mail sending limits.

Note

Alibaba Mail enforces per-minute, per-hour, and per-day sending limits. Exceeding these limits causes the system to reject additional emails. The exact limits are not disclosed for security reasons.

2. The sender's mailbox password is too weak, which triggers sending restrictions.

Note

Accounts with weak passwords are vulnerable to compromise and may be used to send spam. Alibaba Mail restricts sending from such accounts. Once restricted, you cannot send emails to external domains.

Solutions

Choose the solution for your situation.

Solution 1: Reduce sending frequency

If you exceeded the sending limits:

Reduce the frequency and volume of emails. The restriction lifts automatically after the rate normalizes.
- If you exceed the per-minute or per-hour limit, pause sending and retry later.
- If you exceed the daily limit, stop sending for the day and retry after 24 hours.
Alibaba Mail uses multiple concurrent receiving policies that are not publicly disclosed. If you need higher sending limits, contact technical support.

Solution 2: Change your mailbox password

If the error is caused by a weak password:

Change your mailbox password to a stronger one. This lifts the restriction and restores sending capability. How do I change my Alibaba Mail password?.

Note

The new password must meet the following format requirements or the reset will fail.

Password requirements: 9–64 characters, combining at least three of: uppercase letters, lowercase letters, numbers, and special characters. The password must also pass the backend password strength check.