# SMTP Authentication

**URL:** <https://integration.keap.com/t/smtp-authentication/16345>\
**Category:** Max Classic\
**Created:** [October 2, 2017, 6:16pm UTC](https://integration.keap.com/t/smtp-authentication/16345 "2017-10-02T18:16:52Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Catherine\_McKinley](https://sea1.discourse-cdn.com/flex019/user_avatar/integration.keap.com/catherine_mckinley/32/2745_2.png) [@Catherine\_McKinley](https://integration.keap.com/u/Catherine_McKinley)\
**Post date:** [October 2, 2017, 6:16pm UTC](https://integration.keap.com/t/smtp-authentication/16345/1 "2017-10-02T18:16:52Z")

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Recently, we have been getting emails returned that say “Please turn on SMTP Authentication in your email client.” Also, [550-mta-c-24-251.infusionmail.com](http://550-mta-c-24-251.infusionmail.com) [208.76.24.251]:57490 is not permitted to 550 relay through this server without authentication.

How can I fix this please?

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**Author:** ![Jarryd\_Thomas](https://sea1.discourse-cdn.com/flex019/user_avatar/integration.keap.com/jarryd_thomas/32/1894_2.png) [@Jarryd\_Thomas](https://integration.keap.com/u/Jarryd_Thomas)\
**Post date:** [October 2, 2017, 7:22pm UTC](https://integration.keap.com/t/smtp-authentication/16345/2 "2017-10-02T19:22:58Z")

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Hey Catherine,

I sent you a direct message! Let’s see if we can’t figure this out.

-Jarryd

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**Author:** ![shop\_dream](https://avatars.discourse-cdn.com/v4/letter/s/4da419/32.png) [@shop\_dream](https://integration.keap.com/u/shop_dream)\
**Post date:** [February 4, 2023, 1:23pm UTC](https://integration.keap.com/t/smtp-authentication/16345/3 "2023-02-04T13:23:25Z")

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i went smtp settings ?