Thanks Lisa, the problem is fixed.  I checked my computer and somehow 
the month was set for July.  I set it to June and sent a note.  It 
wasn't immediately rejected like it has been previously.

On 6/8/2012 13:03, Lisa Kachold wrote:
> Hi Derek,
>
> This diagnostic error code indicates a known Thunderbird issue sending 
> mail when your time/date are wrong.
>
> Setup ntpd for best results.
>
> You also want to be sure you have perfectly acceptable PTR records for 
> Yahoo and Gmail to enhance deliverability (although this has nothing 
> to do with this problem):
>
> http://www.webmasterworld.com/apache/4231275.htm
>
> On Sat, Jul 7, 2012 at 9:03 PM, Derek Trotter 
> <expat.arizonan@gmail.com <mailto:expat.arizonan@gmail.com>> wrote:
>
>     I don't know who else to ask, but yesterday and today I've had
>     trouble sending email to a friend who has a verizon.net
>     <http://verizon.net> address.  Verizon keeps rejecting them.
>      Here's what I get back from them.  I just don't know who else to
>     ask.  Has anyone else had this trouble?
>
>     thanks
>
>     Message-id:<4FF90584.6030107@gmail.com
>     <mailto:4FF90584.6030107@gmail.com>>
>      Date: Sat, 07 Jul 2012 20:59:00 -0700
>      From: Derek<######@gmail.com <http://gmail.com>>
>      To: John<######@verizon.net <http://verizon.net>>
>      Subject: just checking
>
>     Your message cannot be delivered to the following recipients:
>
>      Recipient address: @relay.verizon.yahoo.com:######@verizon.net
>     <http://verizon.net>
>      Original address:######@verizon.net <http://verizon.net>
>      Reason: SMTP transmission failure has occurred
>      Diagnostic code: smtp;554 Message not allowed - [320]
>      Remote system: dns;mx1-vzn.mail.yahoo.com
>     <http://mx1-vzn.mail.yahoo.com> (TCP|206.46.172.79
>     <tel:206.46.172.79>|34174|67.195.168.231|25)
>     (mta1012.vzn.mail.ac4.yahoo.com
>     <http://mta1012.vzn.mail.ac4.yahoo.com> ESMTP YSmtp service ready)
>
>
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