If you run LUCY with amazon you might experience issues like the following:

• Test Mails do not arrive or with a big delay
• Mails do not get send (and log files show no entry)
• You see many "request failed" errors

This is an indication that LUCY operates with insufficient memory or CPU. Especially after LUCY 4.0 the hardware requirements increased. So the LUCY AMI needs at least 4 GB RAM and 100 GB HDD.