Mail delivery failed: returning message to sender

From: Mailer-Daemon@node5091.myfcloud.com
Domain: IP info node5091.myfcloud.com
MX-server: IP info li1601-187.members.linode.com
Size: 1137 Bytes
Create: 2025-01-28
Update: 2025-10-19
Score: 1
Safe: Yes

This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: ta_china@waters.com (ultimately generated from info@tainstruments.com.cn) host smtp.antispamcloud.com [149.13.75.71] SMTP error from remote mail server after end of data: 550 Message rejected due to user rules. info@tainstruments.com (ultimately generated from info@tainstruments.com.cn) host smtp.antispamcloud.com [149.13.75.71] SMTP error from remote mail server after end of data: 550 Message rejected due to user rules. ddong@tainstruments.com (ultimately generated from info@tainstruments.com.cn) host smtp.antispamcloud.com [149.13.75.71] SMTP error from remote mail server after end of data: 550 Message rejected due to user rules. SYang@tainstruments.com (ultimately generated from info@tainstruments.com.cn) host smtp.antispamcloud.com [149.13.75.71] SMTP error from remote mail server after end of data: 550 Message rejected due to user rules.