I just got this error when trying to post the last message.  The interesting thing is that greenkeys is the one attaching the referenced link of

teletype . net, the search tool that Jordan provides.

So no problem is you're starting a new message, but chokes if you are replying to a message and quote the entire message you are responding to.

I just noticed this starting today. 

(perhaps I shouldn't be so lazy and should trim the cruff when responding?)

____________________________

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  [email protected]
    host mx.spamexperts.com [38.111.198.185]
    SMTP error from remote mail server after end of data:
    550 A URL in this email (teletype . net) is listed on https://spamrl.com/. Please resolve and retry


Reporting-MTA: dns; host4.emwd.com

Action: failed
Final-Recipient: rfc822;[email protected]
Status: 5.0.0
Remote-MTA: dns; mx.spamexperts.com
Diagnostic-Code: smtp; 550 A URL in this email (teletype . net) is listed on https://spamrl.com/. Please resolve and retry
__________________________________________________________________________________________________________ 
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You said "tomorrow" yesterday.

The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD