電郵問題 急 ！！！！！！！！

我用電郵發送郵件去D不存在的電郵地址，結果會怎樣？
另外，幾分鐘後寄左封郵件來.
Sorry, we were unable to deliver your message to the following address.
<[email protected]>:
Remote host said: 554 delivery error: dd This user doesn't have a yahoo.com.hk account ([email protected]) [0] - mta1013.mail.sg3.yahoo.com [BODY]
--- Below this line is a copy of the message.
Received: from [106.10.166.113] by nm24.bullet.mail.sg3.yahoo.com with NNFMP; 24 Jul 2012 06:23:06 -0000
Received: from [106.10.151.139] by tm2.bullet.mail.sg3.yahoo.com with NNFMP; 24 Jul 2012 06:23:06 -0000
Received: from [127.0.0.1] by omp1007.mail.sg3.yahoo.com with NNFMP; 24 Jul 2012 06:23:06 -0000
X-Yahoo-Newman-Property: ymail-3
X-Yahoo-Newman-Id: [email protected]
Received: (qmail 14880 invoked by uid 60001); 24 Jul 2012 06:23:05 -0000
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com.hk; s=s1024; t=1343110985; bh=4tUpE+JB2tVtoRCQMv4LD3c30uaCYUSyQ1kk1IDGjOs=; h=X-YMail-OSG:Received:X-Mailer:Message-ID:Date:From:Reply-To:Subject:To:MIME-Version:Content-Type; b=q+vXZXumd3/gbWh3yV1JwcEBsBs6UYoONqXJg9EOwsBCmIWsR32HHTdEV5yODkIWfxbdi5qU4Lxu/IXMH15Fztcjd6wiT8zB/mVhVXnR1S7VBfIV8nkg86qvdR+HNI0DnkIcQ5+0uTprlbfOph8G83idfCrxpewqCw2pHSA00HU=
DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws;
s=s1024; d=yahoo.com.hk;
h=X-YMail-OSG:Received:X-Mailer:Message-ID:Date:From:Reply-To:Subject:To:MIME-Version:Content-Type;
b=KPyUG7mn6H8v8Gt3JZyOepQWjfnPGhH7VQSxpsKWBXZJM5yZpWs+I3/F5QZZ0CgDiW/s2KqPy4x4BvsOog7UcZyawRPK+cS8E1rlQY4s9zmhBImLwMvhNui0f1OK7uuAqeDdaBMykrZ0EAJqejtsb7K+c9ugg6fLvCPPZfOaChc=;
X-YMail-OSG: rO_1CvMVM1mmKAJl0sP_.jSDgE8iVA3kwUo7fJ0v3i_t8IT
Whm7JqMuxl.FJ8_1_XY4Em6UDGH29tK93HLrl7D80GJF4DTfBX62Y8_Wz3p8
x1TLHt_1I2WbtknF4gv2vvt.2.1AM2W195eeyJonf_eCP2Elh6qt6RnsDWpu
7hEu51_3Mzex_mFcPaJQuF2ca5Aor0rcVazKdd7kdmIp2BcNkHjZnIfqCQY_
iZFrli_VBFYqygPrndw2ewkQos4ItOFtOSDC62PaTH.JfRTsgGvnY86Z64M1
zuGm8wQBJI_UwwdMrdCvMap8N_aTYA8g4_8OK7uwyYFGQBiz9NrvSOD__q1c
ESSY.J4G.NJffp9