Issue with using IMAP on port 993 in eM Client

Hello everyone,

I’m currently experiencing an issue with using IMAP on port 993 in eM Client. I believe this may be related to the initial setup of the email client, which used non-SSL port 143 and asked me to accept/verify the certificate. It seems that as a result, I am unable to connect to port 993.

The SSL certificate is for a subdomain imap-server-com, and I need to use SSL/TLS on server-com on port 993. Unfortunately, eM Client will only connect to port 143 on imap-server-com and not 993 on server-com. My other email clients are all working with IMAP port 993, but eM Client seems to be giving me trouble.

I’ve been trying to find a way to delete the accepted certificate and try to use port 993 on server-com, but I’m not seeing that setting available to me. Does anyone have any suggestions or solutions for this issue? If curious, SMTP works fine on port 465.

Things I’ve tried:

  • Removing the account and adding the account back manually, not through the wizard.
  • Using the fix/diagnose button, but this only fixes it by replacing the server with imap-server-com and using port 143.

Setting up other emails with the same server on ports 993/465, em Client keeps forcing them to use port 143 and 25. Everytime without fail the fix/diagnose buttons revert the settings to 143/25, even when I explicitly set the port and use/force SSL/TLS, all other email clients work on 993/465 (outlook, thunderbird, mailbird)

This is my first time using emClient, it’s a fresh install on Win 11, eM Client 9.2.1735.

Thank you in advance for your help.

What is your email provider?
Port 993 requires to “Use SSL/TLS on special port (legacy)”. Do you see that option in the dropdown list?
Do the same for SMTP on port 465.



Thank you, I was on Force usage of SSL/TLS and not on Use SSL/TLS on special port (legacy).

What a weird problem, I’ve never had this issue with any of the other email clients, but thanks again for solving this for me!

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Glad it worked. Issue had nothing to do with eM Client. It’s the way your server is configured.