One of the members of the ASDF-devel list forwarded this to me because of the cryptic bounce message. Forwarded message:

From: phoebe Goldman <phoebe@goldman-tribe.org> To: Robert Goldman <rpgoldman@goldman-tribe.org> Subject: can't reply to asdf list Fwd: Undelivered Mail Returned to Sender Date: Tue, 26 Apr 2022 09:29:53 -0400

with or without gpg signature, my emails get bounced.

...

Begin forwarded message:

From: MAILER-DAEMON@smtp2.us.opalstack.com (Mail Delivery System) Subject: Undelivered Mail Returned to Sender Date: April 26, 2022 at 9:28:40 AM EDT To: phoebe@goldman-tribe.org

This is the mail system at host smtp2.us.opalstack.com.

I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can delete your own text from the attached returned message.

The mail system

<asdf-devel@common-lisp.net>: host mail.common-lisp.net[148.251.208.23] said: 550 Administrative prohibition (in reply to end of DATA command) Reporting-MTA: dns; smtp2.us.opalstack.com X-Postfix-Queue-ID: 1334DC3761 X-Postfix-Sender: rfc822; phoebe@goldman-tribe.org Arrival-Date: Tue, 26 Apr 2022 13:28:31 +0000 (UTC)

Final-Recipient: rfc822; asdf-devel@common-lisp.net Original-Recipient: rfc822;asdf-devel@common-lisp.net Action: failed Status: 5.0.0 Remote-MTA: dns; mail.common-lisp.net Diagnostic-Code: smtp; 550 Administrative prohibition

From: phoebe Goldman <phoebe@goldman-tribe.org> Subject: Fwd: Define a Simple Echo-Op Date: April 26, 2022 at 9:28:31 AM EDT To: asdf-devel@common-lisp.net

Forwarding without GPG signature, because my signed email got bounced by the mailing list. :/

...

Begin forwarded message:

From: phoebe Goldman <phoebe@goldman-tribe.org <mailto:phoebe@goldman-tribe.org>> Subject: Re: Define a Simple Echo-Op Date: April 26, 2022 at 9:26:39 AM EDT To: zacque <technical+asdf-devel@zacque.tk <mailto:technical+asdf-devel@zacque.tk>> Cc: asdf-devel@common-lisp.net <mailto:asdf-devel@common-lisp.net>

[...snip...]