421 4.7.0 Our system has detected an unusual rate of unsolicited mail originating from your IP

popowich

EQ Forum Admin
Staff member
Hello,

After sending failed did you find the following error message in your mail server logs?

421 4.7.0 Our system has detected an unusual rate of unsolicited mail originating from your IP address.

Check your logs for signs of compromised accounts, IP addresses relaying spam, and/or compromised web sites & forms being used to send spam.

It is also a good idea to separate your outgoing email so that regular emails are not send using the same mail servers as any of your email newsletters & mailing lists.
 

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