Today I was presented with a certificate warning by Thunderbird, titled: “Domain Name Mismatch”. The warning happened as I was sending SMTP mail through mail..com
In the warning text: “You have attempted to establish a connection with “mail..com”. However, the security certificate presented belongs to “mail.dreamhost.com”. It is possible, though unlikely, that someone may be trying to intercept your communication with this web site.”
The certificate looked okay though, it had all the dreamhost info expiring sometime in 2007, but I hadn’t received this message before and later emails also didn’t present the warning.
Does this happen occasionally? Or maybe it was a Thunderbird hiccup? I have TB’s outgoing SMTP set to use “TLS, if available” (default setting).
As a curious experiment, I changed the setting to use SSL and got the exact same warning, although I don’t think there is any SSL connection available for mail, at least not mine. Perhaps more evidence of a TB issue.