Jayson Smith writes:

 > I tend to disagree, based on the following line:

You're exactly right, sorry for the noise.

You're (or possibly user kxxxb is) going to have to ask CenturyTel about
this.  I can't see any problem with the bluegrasspals signature, your
key is in order in the selected DNS TXT record, and based on the 554
status code it really is an authentication problem, not a DNS hiccup
or anything like that.  In your mail, some of the spaces in folded
fields have been replaced by 0xA0 (NO-BREAK SPACE), but I assume
that's your editor or MUA making sure the formatting doesn't get
broken, and there's no other non-ASCII junk.  It doesn't happen in the
header of that mail.

RFC 6376 Domain-Keys Identified Mail says this:

   While the symptoms of a failed verification are obvious -- the
   signature doesn't verify -- establishing the exact cause can be more
   difficult.  If a selector cannot be found, is that because the
   selector has been removed, or was the value changed somehow in
   transit?  If the signature line is missing, is that because it was
   never there, or was it removed by an overzealous filter?  For
   diagnostic purposes, the exact reason why the verification fails
   SHOULD be made available and possibly recorded in the system logs.

You might have to send a test message for this, depending on how long
they keep logs.  Also:

   If the email cannot be verified, then it SHOULD be treated the same
   as all unverified email, regardless of whether or not it looks like
   it was signed.
   (https://datatracker.ietf.org/doc/html/rfc6376#section-6.3)

Of course these days that's more honored in the breach than the
observance. :-(

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