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Question : #5.5.0 smtp;550-Verification failed. I can't send to only one client.
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I can email to everyone else in the world except one company. Everytime I try to email them i get back the following msg. #5.5.0 smtp;550-Verification failed. Please help me. I'm no exchange guru so I am in need of a resolution fast.
Thanks,
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Answer : #5.5.0 smtp;550-Verification failed. I can't send to only one client.
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Some smtp server check ptr(in dns reverse zone) record.
Check your dns have ptr for mail server
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