[Remops] Message loops back to us

[Grotto]

I wonder why I am seeing this in Grotto remailer's error.log.
Is it normal behavior for a new remailer?

[2021-11-05 10:27:22] Info: [472] Message loops back to us; storing in pool rather than sending it.
[2021-11-05 10:39:23] Info: [472] Message loops back to us; storing in pool rather than sending it.
[2021-11-05 10:51:24] Notice: [472] Blocked header line: From: Echolot Pinger <echolot at tincture.ws> matches /^F$
[2021-11-05 11:03:25] Info: [472] Message loops back to us; storing in pool rather than sending it.
[2021-11-05 11:03:25] Info: [472] Message loops back to us; storing in pool rather than sending it.
[2021-11-05 11:15:26] Info: [472] Message loops back to us; storing in pool rather than sending it.
[2021-11-05 11:27:26] Info: [472] Message loops back to us; storing in pool rather than sending it.
[2021-11-05 11:27:26] Info: [472] Message loops back to us; storing in pool rather than sending it.
[2021-11-05 11:27:27] Info: [472] Message loops back to us; storing in pool rather than sending it.
[2021-11-05 12:03:30] Info: [472] Message loops back to us; storing in pool rather than sending it.
[2021-11-05 12:27:31] Info: [472] Message loops back to us; storing in pool rather than sending it.
[2021-11-05 12:27:31] Info: [472] Message loops back to us; storing in pool rather than sending it.
[2021-11-05 12:27:32] Info: [472] Message loops back to us; storing in pool rather than sending it.
[2021-11-05 12:51:33] Info: [472] Message loops back to us; storing in pool rather than sending it.
[2021-11-05 12:51:33] Info: [472] Message loops back to us; storing in pool rather than sending it.
[2021-11-05 13:03:34] Info: [472] Message loops back to us; storing in pool rather than sending it.
[2021-11-05 13:27:36] Info: [472] Message loops back to us; storing in pool rather than sending it.
[2021-11-05 13:27:36] Info: [472] Message loops back to us; storing in pool rather than sending it.
[2021-11-05 13:27:36] Info: [472] Message loops back to us; storing in pool rather than sending it.

Grotto
remop at grotto.thenorthinn.com