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<piya(a)isp-thailand.com>: host mx.mailgw.isspmail.com[188.8.131.52] said: 450
4.1.1 <piya(a)isp-thailand.com>: Recipient address rejected: undeliverable
address: host 184.108.40.206[220.127.116.11] said: 550 5.1.1
<piya(a)isp-thailand.com>: Recipient address rejected: isp-thailand.com
reply to RCPT TO command) (in reply to RCPT TO command)