Error 554 Print

When sending an "unsubscribe" email to a list, an error message may be sent back to the sender with the following error:

spam blocking  smtp;554 mail sent to subscribe address is too long - looks like spam! Send a blank email to unsubscribe 

To resolve this issue, verify automatic signatures are turned off in the member's email client.

and/or

Check that the setting "Check join and leave mail for spam:" is set to "no".

Navigate to:
Utilities : Administration : Server : Server Settings : Security -> Spam Blocking tab