Olga - thanks for the reply - I have copied and pasted the return header message below. I don't really understand whether this is a problem with your G-Mail server receiveing or my Yahoo/Sky server sending. But for your further information it also happens on e-mails I send to your info address. Hope you can help.
"Delivery to the following recipient failed permanently:
support@solveigmm.com
Technical details of permanent failure:
The account theigb@sky.com is disabled.
----- Original message -----
X-Received: by 10.180.103.6 with SMTP id fs6mr37623028wib.11.1421693941024;
Mon, 19 Jan 2015 10:59:01 -0800 (PST)
Return-Path: <theigb@sky.com>
Received: from nm25-vm6.bullet.mail.ir2.yahoo.com (nm25-vm6.bullet.mail.ir2.yahoo.com. [212.82.97.39])
by mx.google.com with ESMTPS id f4si27911207wjy.26.2015.01.19.10.58.57
for <support@solveigmm.com>
(version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128);
Mon, 19 Jan 2015 10:59:01 -0800 (PST)
Received-SPF: none (google.com: theigb@sky.com does not designate permitted sender hosts) client-ip=212.82.97.39;
Authentication-Results: mx.google.com;
spf=none (google.com: theigb@sky.com does not designate permitted sender hosts) smtp.mail=theigb@sky.com;
dkim=pass header.i=@sky.com
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sky.com; s=s1024; t=1421693932; bh=WsA49aDhVo+5lG11OMsrXixDU+WLB1yU/7z2AvS5q2w=; h=From:To:Subject:Date:From:Subject; b=IbnTW0pes1wQfmcqlf6a3IHDV67z8n3Mq2K79f/sEhMnpmmJWJaPSC+gP1arP3PdicNzRkCMwgm+cvIbwUh5sSKLPM5T6PHds+VBz6xzJ4YvvzdCzFlJ5vjhT3sLZbohqluH/Ra/prGmYkjYI20tikH8rfG+wvkgMHEXmRaycLk=
Received: from [212.82.98.56] by nm25.bullet.mail.ir2.yahoo.com with NNFMP; 19 Jan 2015 18:58:52 -0000
Received: from [46.228.39.94] by tm9.bullet.mail.ir2.yahoo.com with NNFMP; 19 Jan 2015 18:58:51 -0000
Received: from [127.0.0.1] by smtp131.mail.ir2.yahoo.com with NNFMP; 19 Jan 2015 18:58:51 -0000
X-Yahoo-Newman-Id: 432396.4563.bm@smtp131.mail.ir2.yahoo.com
X-Yahoo-Newman-Property: ymail-3
X-YMail-OSG: cjyBd34VM1nZBEXKxvT7nvjkpInu955sR_UuNQRv6NgenHA
lLlwoL97tARa.lkfqt_LDAJla9Tswwc67wgTh3G1AccsX1yfiJrZS_rKDHnC
HGa5ysrg19AqonQTrxYJuX07OHUMIvm_LXBaHnxD0FCotGIEZVZ3B5kg45pt
EvvYbKMs2FCHNq6CMfz7t0ucCHa8bg802HNlk4TX1OJdFZsBBmHzshBbWF_l
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Z4EdQVedkbK35ucu0JOPgikbk_NuhUFfb0kEUz0K1HvOxb7c6nMCe2l90R9Q
x.JzPV_zYfU9MzCg-
X-Yahoo-SMTP: UbCs2zaswBBPo6aVkFZ1mTTHCbRF1QtKalfWDbLhLGyZV.aNxiLUPrp4ejFx