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Exchange 2013 to Exchange 2007 mail queue is stuck with error 451 4.4.0 - 235

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Hello,

When sending mail from exchange 2013 to exchange 2007 using SMTP relay to mailbox delivery group, mails stuck in queue with the error:

 [{LRT=5/12/2015 6:03:24 AM};{LED=451 4.4.0 Primary target IP address responded
 with: "235 00000734YIIFYgYJKoZIhvcSAQICAQBuggVRMIIFTaADAgEFoQMCAQ6iBwMFAAAAAACjggQJY
 YIEBTCCBAGgAwIBBaEOGwxDT01WRVJTRS5DT02iLjAsoAMCAQKhJTAjGwdTTVRQU1ZDGxhVUy1ETlYtTUJYM
 i5jb212ZXJzZS5jb22jggO4MIIDtKADAgEXoQMCAQKiggOmBIIDop6UphxXPkD6/d/XwUsUhRj5/X2JXeFxo
 0EmvOhRJ+G5xb4tHnHk0R9m0vyKgbYT9FqOeMjcMw75E6P2SDNsLbpRbG9JwfJQtfhN+R5qNnFh1fhDFOT/x
 JgPCZSUizubYaEDB+eJoeppedCXNwfoAm24EAjPKMAi6kp+G0FbjBHQIT/HN5d6AHP76kOWZg9w0gk89Chmy
 1WGZ4GwraDr02S6AYBLKlrBWsNxo1Hdj0ZeKyD20kEukTxrpTbDxbU7Mtw8y1wMCrjTiO7mgS4EeUrUEJWCp
 fBiR3aOfvP+PDHBCNIb3djENseRhdBHCx6zi4N0mjuy1K11o6P1w6YoSe+GF3YrIAJT3yYHYLfY1b6xr6g50
 RH5wSNqnmUtPaWJidXXgNvPUZtZBKiTwCZs2TsuzEYoYT944prLHvL4KUekMFzMEA2oyb4RkrvBjBckQ0kHj
 4YGR7YYaFBs16arMrI7ZJiB+PYCdDOFfZb3A0WyMeCfcl26GAKFVq38LlKl0DyybkTIS4S3eVCTf7ji+APZX
 iG1P1BicwKPscbkhyPNBOGqnnIog9dCHqfjT3hiU6CX+iW8HzBAkrAyH02rU80ftCpoei+D2ZVYkWtExVDgJ
 LsBc3ix5MPX52djmZR86l1G6FiNVhGhNBq3yzNG2Dqi3CgFVVjmX8z6+YqaYeMjQUKyaCLxsh+buuXBmbWVX
 h0JfYOyOMymwZS32eTeZGRLP2czHMOlPZ1i45MPQW8qxwDHVZo8rJkqz1A6U2FYbjR8/4l/2U5NkWuADMe/n
 953Ow8Y3WAMvAIr2mISxLCh19lgCUvN1ogRNMjlgyoE0QSqDf7Ww0IT4kYTa84a0ZpIZhc5cBIUzHLDqwPbv
 EDdzyKaJcYNJ3ZWtwqdHmts6GwNy3SqMuYEYuDL0CinXl6Q/M92BLqeEaOmpXbQe+Nmd1pHnnPujciGAmnX1
 scPw0DC1ihr8rXGPmOhhs29OAO8bg8XBThYWqwtfPjNu5iZPb1HrvLEVdtBPZEkohNd8GtX0G3Qm7r1xvhq1
 y6oAt8CmEgv/BnD7bqkO/oum+1a4Qpl0XlnzwfISNIJ/aP0nZH01KgHcWFe472KkjubzJscARmoOponEsRzT
 dWMWfCuB/cip/J3dBc7KjJCJQsrudvGTvkr24ilFENQsrYQOpegPe7QlfiV81/4WGAc9TQjZ5a5Uin4NfQoW
 nD7zx77xk9Q349SOY/8wplvxJh9xK8FS6SCASkwggEloAMCAReiggEcBIIBGO9tALYtk9VDfo+h8LzRHPA+k
 N1SsEXqDooPcZEIpgNw+6stqoAVRc4GLb9IC13x27GAFYTzeTo8hNRDeawXGAaBxvfaVH2NNgEoOxqREUEf7
 Q+77HGxJQjqcnvU/UCMM1UomvNG3JPAhu/Xje56yY5Ijl+WTjY0PfZCepkzdIqT+IBt3INwCWZnvj8znNPrD
 5BdSRFwqqkKxtAAcoK6oJolX0MXdhqIiwwdtiTBFTK8gN/Yt7PdG6Qu/AFeLHIXNR0QcGmLVMVdq3zG3ydgM
 3j65sLK6L/9nTwUqEk66kTZzKI5h+Vm0ta4DV5fesH2qP7+78a2+9KiEoVx8s5ShiQy7QMY2Iyp8psD9hxkn
 j91OjhnVTE1G9E=0000002CBHN0baxt/4Fec5gQa3hWkqr4BEVcGS/iLwNbL4ZETcc=." Attempted
 failover to alternate host, but that did not succeed. Either there are no alternate
 hosts, or delivery failed to all alternate hosts. The last endpoint attempted was....

I tried to telnet exchange 2007 and had no problems...

What is this?


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