Don't allow username or password to contain line break #7693
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Much of our protocol code isn't prepared to deal with line breaks in the username or password. Since IMAP, POP3, and SMTP are line-based protocols, this could lead to command injection. We avoid this by not allowing the username and password in
ServerSettingsto contain line breaks.We still need to make sure we don't allow the user to enter such values (see #7670).