See this topic: https://support.mozilla.org/en-US/questions/1304643

I'm using POP3, not IMAP. Your reference to another person's question, in which it refers to yet another person's question about settings for IMAP is not helpful. Why doesn't hughesnet have a support page that helps users set up account settings for different email programs? Is pop3.hughes.net the correct server name? Is port 110 the correct port number? is the username the complete email address or is just the part without @hughes.net? is the connection security none, or STARTTLS, or SSL/TLS? Is the authentication methods "password, transmitted insecurely" or "normal password" or "encrypted password" or "Kerberos/GSSAPI" or "NTLM" or "OAuth2"? Is the outgoing server name smtp.hughes.net or is it mail.hughes.net? what is the Port number? thanks

https://issuu.com/tyagivishi008/docs/hughesnet_email_pdf

http://www.dbsinstall.com/Direcway/emailSetup/Mozilla.asp

Based on those sources, the incoming mail server is mail.hughes.net for POP and IMAP. POP: port 110 with security = none, authentication = password, transmitted insecurely, User Name = email address

or

port 995, SSL/TLS security, authentication = normal password, User Name = email address

Outgoing server smtp.hughes.net on port 465, SSL/TLS, normal password, email address

or

port 587, security = none, authentication = password, transmitted insecurely, User Name = email address

Thanks - I had this same information yesterday after doing google searches. None of these options worked. I tried calling hughesnet this morning but after an hour on hold, I finally got someone who spoke bad English and really didn't understand the problem - he kept putting me on hold for long periods of time and kept coming back with asking me if I was having trouble with sending emails. And after the 5th time telling him that all I wanted was to double check the account settings (server settings and outgoing server settings) so I can check if they are correct, he said he would need to transfer me to technical support (so all this time I thought I was talking to someone at technical support and I wasn't?). He also said there would be a charge! We pay a huge monthly bill to hughesnet, and they can't even provide help when something goes wrong. Anyway, after wasting my morning, I tried the following settings: server name: pop3.hughes.net, user name: my email, port 110 (default), Connection security: none, authentication method: password, transmitted insecurely. That worked, and it started downloading emails (after asking me to type in my password) However, my son had sent me an email with an attachment on the 16th, and so far it has downloaded 13 copies of the same email continuously and still going strong. I logged into webmail on hughes.net, the email isn't even there! so I couldn't delete anything on the server. I also tried deleting everything in trash. I closed Thunderbird and tried again, and it downloaded another copy of the exact same email from my son. I'm at a loss. I tried outgoing server as follows: smtp.hughes.net with port # 587 (default), connection security: none, and authentication method: password, transmitted insecurely. It asked me for the password again upon clicking send, and seemed to go through OK, but I'm still waiting for the test email to arrive to my business email address in box. Meanwhile a copy more exact emails downloaded into my hughesnet email in box. It seems that Thunderbird is not recognizing the fact that my son's email had already been downloaded 15 times.

This morning, I received the incoming emails for hughes.net using the settings above. Still trying to send messages. At least I'm getting error messages this time: Sending of the message failed. Peer using unsupported version of security protocol. The configuration related to smtp.hughes.net must be corrected. I tried all combinations for it, and the only combination that seems to work is: Server name: smtp.hughes.net, port 25, username: my email address, connection security: none, and authentication method: Password, transmitted insecurely. But then I had a new hick up. My business email had been working perfectly yesterday was not receiving emails - this account is through justhost and not hughesnet. I have two different, independent companies with email addresses. So one business email account with justhost was working and one was not! This is absolutely crazy! However, justhost has an excellent support website with tutorials on how to set up the account settings, and I was able to get this one up and running again in a few minutes. Hughesnet really needs to set up a support website that is useful. I wasted two precious days trying to get information that should be freely available on their website. But there is no reasonable way to connect with them, and I'm not wasting hours trying to do that again. I think they may have changed their email vendor to someone called "zimba" in August (found that out by getting webmail on their site yesterday). We get so much junk and spam emails, that both my husband and I thought it was a spammer and not hughesnet. They need a better way to communicate with their customers other than announcing changes through zimba and asking someone to click on an unknown link in an email from someone you've never heard of before.

Some users report that a workaround is by toggling the value of the option security.tls.version.min from 3 (or 2) to 1. Also you might try to set security.tls.version.enable-deprecated = true, for sending mails to work. Would it help?

thanks - but I solved it myself by trying different permutations of the settings.

Can you share with us what options worked in the end? Might help also other persons...

The error you saw: 'Peer using unsupported version of security protocol.' is the reason you can't use secure server settings. The workaround, until Hughes corrects their servers, is explained in the link in my first reply.

The following settings settings worked for hughesnet: server name: pop3.hughes.net, user name: my email (was just the name before it stopped working without the @hughes.net), port 110 (default value - can't remember what it had been before, but I tried so many different combinations, I was getting cross-eyed), Connection security: none (it was STARTTLS before) , authentication method: password, transmitted insecurely (it was normal password before). These are the only options that worked - (I tried every combination I read to try after many google searches, and before I tried to contact Mozilla community for help). That worked, and it started downloading emails. It had gotten to my son's email he sent to me on the 16th and just started downloading it over and over again. After trying to change settings to other values, I finally gave up and set them back to the above values to what worked before turning off the computer and going to bed. The next morning, it was working fine and downloading emails normally. But I still couldn't send. After trying each possible value for the port, the only combination that worked was to set it as follows: Server Name: smtp.hughes.net, Port: 25 (the default says 587, but that does not work, I also tried other values that didn't work), Connection security: none (it used to be STARTTLS before it stopped working), Authentication method: Password, transmitted insecurely (used to be normal password before it stopped working), User Name: my email (it was just the part before the @hughes.net when it had been working in the past). As with the incoming server, I tried every combination with and without security for the port number. The above combination is the only one that worked. I can't believe that hughesnet offers zero guidance on what the settings should be. My husband and I both received an email in August from zimba at hughesnet that we thought was spam asking us to click on a link to set up email. It may be that "Zimba" took over the webmail utility for hughesnet because when I checked webmail through My Hughesnet, it had zimba in the web address. But what kind of company sends you an email asking you to click on a link in an email in this day and age? Nobody in their right mind would do that in case it is a spammer or worse - someone trying to take over your computer for ransom. With the justhost business email account, it took 5 minutes to fix that - I logged into the cpanel, quickly found the tutorial on setting up email clients with POP, and got the settings immediately. Thanks for your time in trying to help me. I was hopeful that Mozilla would have guidance from hughesnet about this that I couldn't find on their website. But you ended up finding the same confusing advise on the internet that I did (that is, it could be this or that - or whatever!). The pop3.hughes.net is not something I could find on the internet or the answers here. This server name is the one that worked before it stopped working. Anyway, I did try setting more secure options before just giving up and returning to insecure options again. They are the only ones that work with hughesnet.

Thanks but the link provides incomplete information? In it, you say something that doesn't have nothing to do with my issue, and the person responds with a thank you. There are no account settings listed in that thread. In that thread, there is another link to another thread that didn't help either. Maybe some of the back and forth threads are missing so I could only see the beginning and the end with the middle part explaining the solution missing? That is becoming a common problem now a days. You find a support thread with someone having a similar problem, but instead of seeing what the solution is, all you see is the first and final exchanges - which are missing the solution.