# Email SMTP Port 25 SSL Error

**URL:** https://forum.mautic.org/t/email-smtp-port-25-ssl-error/35244
**Category:** Mautic 5 Install/Upgrade Support
**Created:** [March 11, 2025, 1:25pm UTC](https://forum.mautic.org/t/email-smtp-port-25-ssl-error/35244 "2025-03-11T13:25:46Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![andrew\_c3](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/andrew_c3/32/13547_2.png) [@andrew\_c3](https://forum.mautic.org/u/andrew_c3)
#### Post date: [March 11, 2025, 1:25pm UTC](https://forum.mautic.org/t/email-smtp-port-25-ssl-error/35244/1 "2025-03-11T13:25:46Z")

</div>

**Your software**  
My Mautic version is: 5.2.2  
My PHP version is: 8.3.15  
My Database type and version is: Mariadb 10.5.27

**Your problem**  
I have just installed Mautic 5.2.2 for the first time and can login in ok.  
I have setup email for SMTP port 25 and when I press test I get an SSL Operations failed error.  
tls\_process\_server\_certificate:certificate verify failed.

SMTP port 25 should be sending emails without encryption so I’m surprised to get a a tls error. There is no field to select encryption type is none. Therefore mautic must have encryption coded based on the port.

I’m using an on-premise email server with a self signed certificate. I can telnet to this server with the logon credentials and it works fine. Other servers are using it in a similar way successfully

Is there a way to modify the mautic code to fix this problem as I wish to connect to this SMTP port 25 server.

Thanks.