Items in alt.anonymous

Subject:Please turn on SMTP Authentication in your mail client.|server.egitmenkoleji.com (congeries.org.uk)
Date:Tue, 21 Apr 2020 07:35:29 +0200 (CEST)
From:"Anonymous Remailer (austria)" <mixmaster@remailer.privacy.at>
Newsgroups:alt.privacy.anon-server, mail.cypherpunks, alt.cypherpunks, alt.anonymous.email, alt.anonymous

18:53:39.406 > SMTP SSL Status Info: Cipher: name = ECDHE-RSA-
AES256-GCM-SHA384; description = ECDHE-RSA-AES256-GCM-SHA384 
TLSv1.2 Kx=ECDH  Au=RSA  Enc=AESGCM(256) Mac=AEAD|; bits = 256; 
version = TLSv1/SSLv3;
18:53:41.181 0 SMTP State: None of 9 chunks sent.
18:53:41.181 0 SMTP Error: Please turn on SMTP Authentication in 
your mail client.|server.egitmenkoleji.com (congeries.org.uk) 
[185.86.5.223]:41522 is not|permitted to relay through this 
server without authentication.: 250 - Reset OK
18:53:41.571 > SMTP State: Disconnecting.
18:53:41.571 > SMTP Response: server.egitmenkoleji.com closing 
connection

This has begun happening randomly since around Friday or 
Saturday April 18-19.  Happens when sending randomly via OmniMix 
using the SMTP server.