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The mail system
<piya(a)isp-thailand.com>: host mx.mailgw.isspmail.com[126.96.36.199] said: 450
4.1.1 <piya(a)isp-thailand.com>: Recipient address rejected: undeliverable
address: host 188.8.131.52[184.108.40.206] 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)