Unable to send to one addressee: server response 5.1.1 recipient rejected

Split from this thread.

I, too, have had this problem - when sending a group e-mail, only one "bounces back" with the following error message:

"Sorry, we were unable to deliver your message to the following
address.

[e-mail address]
Remote host
said:
550 5.1.1 [e-mail address] recipient
rejected
 [RCPT_TO]

--- Below this line is a copy of the
message.

Received: from [66.196.81.160] by
nm26.access.bullet.mail.bf1.yahoo.com with NNFMP; 19 Jul 2015 05:22:52
-0000
Received: from [98.139.221.250] by tm6.access.bullet.mail.bf1.yahoo.com
with NNFMP; 19 Jul 2015 05:22:51 -0000
Received: from [127.0.0.1] by
smtp120.sbc.mail.bf1.yahoo.com with NNFMP; 19 Jul 2015 05:22:51
-0000
X-Yahoo-Newman-Id: *** Email address is removed for privacy ***
X-Yahoo-Newman-Property:
ymail-3
X-YMail-OSG:
qdEPm9kVM1kwVni6OHdv8JUcLElFsovRy1drUVldCxuRFKA
 Ej9LT98Sf7kMPwCF0VU_FtsgqRbuyC.ORLs0ax0gnivqhrBtIMfOnRQWNW6k
 fqtru4uJdsCxYMBt2DC_Jue9RqYwagf4d5Fz7KLB7H1wP5HDeZVW_HvyBZ5j
 4tOuRV3Onyi7iQjjacWmd7kdzCnQMfSchjT7PkY5DUjbCQPElgs_gOAcwRrB
 _gYTslXvDYI7f1oc8Y5BMEQA5R3uyye1ilCmSe7FBAfGsdwEtQUcdi.yrUkz
 fwhhHO1xLt_jrscSd0sOFRoqiArkEMtZd.otexMEr7bMwIxXva6RW3z_cfKP
 shFV031.FeeYsT9AGz1dAcM.8qybT9O0eBj7gi4hUZKKaYXWMmSitCJ4Jxgf
 Qhsi5aMdk5Mbv3a6qXWnw1WvQCJl7RMIWmFiQSJlmLejAMG.pEAzNY_SwwOh
 cHUiqzotC4mdo5QgUTalkBu.kLpsonyR0G9R3hp86Yfzd0oFTdMan9dRTCnR
 7XFeso_fD0g--
X-Yahoo-SMTP:
.hvI4c6swBANfebQ6IFZdono3GtJrQN8cSdlBBI-
Message-ID: <F987C99B88D84D41A16DD8671B1E435D@ArnoldPC>
From:
[me @ my e-mail address]
To:
<Undisclosed-Recipient:;>
Subject: [subject]
Date: Sat, 18 Jul 2015 22:22:44 -0700
MIME-Version:
1.0
Content-Type:
multipart/related;
type="multipart/alternative";
boundary="----=_NextPart_000_0018_01D0C1A8.44D59960"
X-Priority:
3
X-MSMail-Priority: Normal
Importance: Normal
X-Mailer: Microsoft
Windows Live Mail 16.4.3528.331
X-MIMEOLE: Produced By Microsoft MimeOLE
V16.4.3528.331

This is a multi-part message in MIME
format.

------=_NextPart_000_0018_01D0C1A8.44D59960
Content-Type:
multipart/alternative;
boundary="----=_NextPart_001_0019_01D0C1A8.44D59960"

------=_NextPart_001_0019_01D0C1A8.44D59960
Content-Type:
text/plain;
charset="utf-8"
Content-Transfer-Encoding: quoted-printable" [end of error message]  ~ ~ ~ Since I use Verizon e-mail, I was also able to send a test email to this same recipient using the very same email account with Yahoo! web mail:  it goes through fine and the response is received fine.  Any assistance that can be provided would be greatly appreciated.  Thanks so much in advance.