# SMTP Failed (SMTPSendFailedException: 550 5.7.51)

**URL:** <https://forum.inductiveautomation.com/t/smtp-failed-smtpsendfailedexception-550-5-7-51/87878>\
**Category:** Ignition\
**Created:** [March 26, 2024, 8:43am UTC](https://forum.inductiveautomation.com/t/smtp-failed-smtpsendfailedexception-550-5-7-51/87878 "2024-03-26T08:43:45Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Nawaf\_Oteif](https://avatars.discourse-cdn.com/v4/letter/n/cc9497/32.png) [@Nawaf\_Oteif](https://forum.inductiveautomation.com/u/Nawaf_Oteif)\
**Post date:** [March 26, 2024, 8:43am UTC](https://forum.inductiveautomation.com/t/smtp-failed-smtpsendfailedexception-550-5-7-51/87878/1 "2024-03-26T08:43:45Z")

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I'm trying to send test email but the failed coming:  
com.sun.mail.smtp.SMTPSendFailedException: 550 5.7.51 TenantInboundAttribution; There is a partner connector configured that matched the message's recipient domain. The connector had either the RestrictDomainsToIPAddresses or RestrictDomainsToCertificate set [[AM3PEPF00009B9C.eurprd04.prod.outlook.com](http://AM3PEPF00009B9C.eurprd04.prod.outlook.com) 2024-03-26T08:33:52.129Z 08DC46B0ACC816AC]

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/b/5/b5da05fd7fc1bccd21a74a277267b87c67f84429.png)

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [March 26, 2024, 11:24am UTC](https://forum.inductiveautomation.com/t/smtp-failed-smtpsendfailedexception-550-5-7-51/87878/2 "2024-03-26T11:24:06Z")

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That error means your SMTP server is rejecting your mail. You will have to get your IT department to add your Ignition server to its permitted senders list. There is nothing you can do on the Ignition side to fix this.