About a week ago the problem began. I could not use Thunderbird to send or receive mail.After numerous calls to my ISP I learned that they updated their server and changed the name. After considerable effort on my part, I was able to receive email but I still cannot send it from that app. Yesterday I again spoke to my ISP. They said that since I can use their website to send and receive email, I am on my own in respect to the app. I really prefer using the app. I tried changing the name in the outgoing server, but it did not help. Any advice will be appreciated.
I was able to get half way. I can receive email but cannot send it. When I try to send email, I get the following.
Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) blank.optimum.net is unknown. The server may be incorrectly configured. Please verify that your Outgoing server (SMTP) settings are correct and try again.
Please note that I left out my full email address for obvious reasons.
My Thunderbird settings for outgoing server are shown below. Have you used these settings? If you are still getting the server is unknown message then sync-cloud.optimum.net can't be correct. Have you tried mail.optimum.net? You should also verify the Connection Security setting and the Authentications method setting. https://imgbb.com/>
QUOTE: The description can be anything you like. The outgoing server is always different to the incoming server. What settings did you use? What error message did you get?
Sending of the message failed. Failed due to unexpected error 80004005. No description is available. The message could not be sent using Outgoing server (SMTP) sync-cloud.optimum.net for an unknown reason. Please verify that your Outgoing server (SMTP) settings are correct and try again.
I'm not sure what that error code indicates. Just as a test try setting the port to 465 as in my setting and set the other options as well. If it still fails what is the error message? ISPs usually have these settings documented on their website. Can you log on and see if they are there? If not then surely they should be able to tell you exactly what the settings should be.