mozilla thunderbird mail server responded user not local

If you used to be able to login and it suddenly stopped working, see Password not remembered.One way to detect if there is a trailing blank space is to click on the username or password and then press Control-A to select (and highlight) the entire entry. Thunderbird should ignore that blank space, but it doesn't. If you copied and pasted either the username or password its possible it has a trailing blank space.Hotmail is the only known email provider with this quirk, but there might be others. The workaround is to change your password in webmail to 16 characters or less, delete the saved password in Thunderbird using Tools -> Options -> Security -> Passwords, and restart Thunderbird. However, if you use a email client such as Windows Live Mail or Thunderbird with a password longer than 16 characters, it will fail. If you try to login using webmail it will succeed as long as the first 16 characters are correct. The webmail user interface will let you set a password longer than 16 characters. Hotmail uses your Windows Live Id to log in.Check the support page on your email providers web site to see if you're using one of the mail servers it lists. It might also fail if you're an older mail server that your email provider is phasing out. However, sometimes you get a misleading error message about an invalid username/password. Usually if you use the wrong setting for secure connection or secure authentication you will get a error message about it couldn't make the connection or the connection attempt was rejected.Don't assume that whatever username you might have used with webmail you can use with an email client. Others expect just the portion to the left of the in the email address. Some email providers expect you to enter the full email address as the username.Mail server responded: invalid user/password Its probably not due to your firewall - that would either cause some type of connection error or silently fail. It might also be due some other setting in Tools -> Account Settings -> Server Settings, a problem with your anti-virus program, a problem due to upgrading, or having non-alphanumeric characters in the password (the CompuServe POP server rejects passwords that are accepted by webmail). If the password is rejected when Thunderbird tries to login to the mail server its usually due to using the wrong username, not the password. This article was written for Thunderbird but also applies to Mozilla Suite / SeaMonkey (though some menu sequences may differ).

Mozilla thunderbird mail server responded user not local