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5.1.0 Address rejected

Hello All;

Our Email gateway is rejecting all email traffic and we are getting rejected bounced emails after some hours. When i do an SMTP test on the MX Servers i am getting the following response:

Connecting to x.x.x.x

220 esa1.x.y.z ESMTP [1453 ms]
EHLO keeper-us-east-1c.mxtoolbox.com
250-esa1.x.y.z
250-8BITMIME
250 SIZE 15728640 [781 ms]
MAIL FROM:<supertool@mxtoolbox.com>
250 sender <supertool@mxtoolbox.com> ok [2766 ms]
RCPT TO:<test@mxtoolboxsmtpdiag.com>
550 #5.1.0 Address rejected. [766 ms]

LookupServer 7938ms

While for a normal SMTP Test we get:

Connecting to x.x.x.x

220 HE1EUR01FT034.x.y.z Microsoft ESMTP MAIL Service ready at Wed, 6 May 2020 13:20:45 +0000 [750 ms]
EHLO keeper-us-east-1c.mxtoolbox.com
250-HE1EUR01FT034.x.y.z Hello [x.x.x.x]
250-SIZE 157286400
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-8BITMIME
250-BINARYMIME
250-CHUNKING
250 SMTPUTF8 [710 ms]
MAIL FROM:<supertool@mxtoolbox.com>
250 2.1.0 Sender OK [727 ms]
RCPT TO:<test@mxtoolboxsmtpdiag.com>
550 5.7.64 TenantAttribution; Relay Access Denied [HE1EUR01FT034.eop-EUR01.x.y.z] [781 ms]

LookupServer 3658ms

Please help us troubleshoot this issue immediately.

3 REPLIES 3
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Cisco Employee

Hello,

 

RCPT TO:<test@mxtoolboxsmtpdiag.com>
550 #5.1.0 Address rejected.

The above error usually occurs when you don't have a RAT table entry for the recipient domain"mxtoolboxsmtpdiag.com".

 

I would request you to add the same to the RAT table and check.

 

Cheers,

Pratham

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Was this a fix, the mxtoolbox thing?

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Same here dont know how to resolve the problem.