Thunderbird - can receive but not send in e-mail
Until recently all worked fine with my charter.net (spectrum) e-mails but now I can receive but not send. When I try to SEND a message I get "The mail server sent an incorrect greeting: impout007.msg.chrl.nc.charter.net cmsmtp 75.177.111.151 blocked . . . OUT-1130" error. I have talked to the Spectrum tech people - several times - and done many experiments. All settings seem to be correct, all works fine on their webmail server, etc. They say that they are not having a big bunch of people call in with this problem. Like I said, it used to work a few weeks ago. I am wondering how I can get the previous version of Thunderbird back because I am thinking that might be my problem.
Chosen solution
The reality is thanks to your persistence they fixed a error they made in their spam filters. Next time you will have to go through it all over again. This is not the first time Charter have used the blacklist to block their own customers sending mail. I doubt it will be the last.
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lets start at the beginning. Sending from the web mail is no even remotely like sending using SMTP. That their support is trying to tell you differently indicates just how poor the support you are paying for is.
the item 75.177.111.151 blocked is a message from the server impout007.msg.chrl.nc.charter.net that the ip address 75.177.111.151 is being blocked from sending mail. I looked up that IP addresss and it is registered to Charter communications. See https://myip.ms/info/whois/75.177.111.151 So charter is blocking mail submitted by an IP address they issued. The OUT-1130 would appear to be additional diagnostics information.
A few google searches led me to https://www.spamhaus.org/pbl/query/PBL1559139
I know charter to be long term users of spamhaus to filter mail, but it would appear that they employ some truly bright people that have allowed a blocklist entry they created to block the reception of email to their outgoing mail server from their own customers.
I think you probably need to try the support at spectrum again, this time insist that you speak to someone from level two support as clearly this is beyond the capacity of the script readers on the main phone support. Someone a Spectrum actually needs to do something to fix their mail server block list. It certainly is not something Thunderbird can help with as it is only involving the spectrum outgoing server.
The only other possibility, beyond incompetence at spectrum, I can see is your account is not correctly configured in Thunderbird. I have left this to last as spectrum have already told you everything appears correct. But check it non the less. Their other support so far looks decidedly shaky. Out of date settings might be the case if it has been set up that way for years as spectrum have made changes since their acquisition and this might be their way of telling you about them.
Spectrum suggest the server name is Charter.net
Incoming Email Server: mobile.charter.net Outgoing Email Server: mobile.charter.net
As your issue is with sending, access account settings, scroll to the bottom of the account list and open "outgoing server (SMTP)" to verify your outgoing server is named correctly. It is interesting they fail to advise as to the ports and encryption settings are, so I guess we have to ass-u-me they are the same as for spectrum on Port: 587 with SSL/TLS
I finally DID get my problem solved - - after speaking to a total of 8 different Spectrum people. Of course, the first few it was the same old stuff: checking server ports and other account settings. My 5th person mentioned the possibility of Spamhaus block. On my 6th person (who told me that I didn't even have e-mail set up) I asked to speak to the boss who took to my suggestion that it seemed that my IP address was blocked on Spamhaus. So he told me to turn off my modem and router at 6 pm then turn back on because that's when I'd be getting a new lease and I MIGHT get a new IP address. In case that didn't work, he also scheduled a tech person to bring me a new modem the next day (which was a Sunday at 8am !). Neither of these changed my IP address. So the tech person messed around awhile with no luck. Told me to call them again the next day which I did and asked to speak to a person who actually works with the servers. I didn't get to do that, but they did give me a ticket number and said the back end guy would look into and get it fixed in 24-72 hours. It started working in about 24. I still have my same IP address. I called to see what the problem had been - if maybe they took the block off. They said it was a problem with the server. I asked wouldn't there have been a lot of people complaining. They said that there may have been but I had been persistent so had helped them to fix it. (Who do I call to get paid for that service?? ha ha)
Chosen Solution
The reality is thanks to your persistence they fixed a error they made in their spam filters. Next time you will have to go through it all over again. This is not the first time Charter have used the blacklist to block their own customers sending mail. I doubt it will be the last.