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My ISP (Spectrum, out of Time-Warner) has apparently made some changes to their mail system, and a lot of people (in particular, me) have been unable to send mail (Incoming works fine).
In my case, using Eudora, I get an error of "Server SSL certificate rejected". [1]
I am able to send mail if I turn off SSL in Eudora's 'sending mail' setup.
Question: How important is this?
I think, not much - that it would only bring the security of e-mail traffic between my PC and the ISP's mail server down to the same level (none) as it would have for the rest of its trip through the 'net.
[1] If it matters, Wireshark shows my PC sending a "Fatal decrypt error" packet.
All best practices regarding security aside: the thing I would worry most about is my traffic being sniffed near me, like being on a public WiFi network. – mtak – 2017-10-03T13:40:46.290
1If I were to guess it sounds like Spectrum has enabled SSL/TLS server side and are only allowing TLS 1.1+ clients, if Eudora or your OS does not have support for it the fact the certificate is rejected by client seems to point to this fact – Ramhound – 2017-10-03T14:06:18.177
@Ramhound - Does it say anything that WireShark lists the protocol on those pkts as "TSLv1"? – George – 2017-10-04T01:42:12.810
Right; Its confirmation TLSv1.1+ is being used. I still suspect the client is the problem. It’s possible the certificate is invalid but that seems unlikely even if we are talking about Spectrum – Ramhound – 2017-10-04T01:46:51.290