--- title: How to know what smtp is the customer using description: this is to better know what the customer relay is to better work with the email issue they might be having. --- [Skip to content](https://help.clubspeed.com/clubspeed-knowledge-center/how-to-know-what-smtp-is-the-customer-using#main-content) English Show submenu for translations [More support](https://help.clubspeed.com/clubspeed-knowledge-center/kb-tickets/new?hsLang=en) [![Clubspeed Logo](https://help.clubspeed.com/hs-fs/hubfs/Logo_Grey.png?width=500&height=86&name=Logo_Grey.png)](https://help.clubspeed.com/clubspeed-knowledge-center?hsLang=en) Open main navigation Close main navigation - English Show submenu for translations - [More support](https://help.clubspeed.com/clubspeed-knowledge-center/kb-tickets/new) - [Contact us](https://share.hsforms.com/1B5QyPF-YRQutaoGEnmQD5w1etz6) [Contact us](https://share.hsforms.com/1B5QyPF-YRQutaoGEnmQD5w1etz6) How can we help you? - There are no suggestions because the search field is empty. 1. 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[FAQs](https://help.clubspeed.com/clubspeed-knowledge-center/faqs?hsLang=en) December 1, 2025 # How to know what smtp is the customer using Log into the customers server, go into the windows search bar and type in IIS 6.0 manager and enter. click in the severs domain name that will open the SMPT relay option, right click that and select properties ![](https://help.clubspeed.com/hs-fs/hubfs/image-png-Dec-01-2025-09-55-03-7545-AM.png?width=751&height=483&name=image-png-Dec-01-2025-09-55-03-7545-AM.png) Go to the Delivery tab\> Advanced...\> and there you will see the customers SMTP Relay. ![](https://help.clubspeed.com/hs-fs/hubfs/image-png-Dec-01-2025-10-07-02-1092-AM.png?width=666&height=442&name=image-png-Dec-01-2025-10-07-02-1092-AM.png)   - [FAQs](https://help.clubspeed.com/clubspeed-knowledge-center/faqs?hsLang=en#main-content) - [Software Questions](https://help.clubspeed.com/clubspeed-knowledge-center/faqs?hsLang=en#software-questions) - [Payments Questions](https://help.clubspeed.com/clubspeed-knowledge-center/faqs?hsLang=en#payments-questions) - 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