On 13.01.25 15:36, Peter via Postfix-users wrote:
Your smtp (25) and submission (587) ports are serving a different certificate, port 25 is serving the letsencrypt cert, but port 587 is serving a self-signed certificate (which is what thunderbird is seeing):

depth=0 CN = mail.servicemouse.com

verify error:num=18:self signed certificate

verify return:1

depth=0 CN = mail.servicemouse.com

verify return:1

250 PIPELINING

DONE

CONNECTED(00000003)

---

Certificate chain

0 s:CN = mail.servicemouse.com

  i:CN = mail.servicemouse.com

I guess Scott has still dovecot configured on submission port and haven't configures SSL certificate in it.


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