Revert "Redeuce number of emails for test"

This reverts commit 0dd143b19105101b78964aa5b2fd6dfacfb37cd6.
Reduce tcp_connection buffer size
Revert "Enable more debug"

This reverts commit 3aa3de5081d48980b16d5acd0cf480b538bd9a92.
Revert "Enable mail debug"

This reverts commit 4d9bdae21f198e0d8b12a614ad620726eb33633e.