
You could use netstat to list your connections. If the log file is empty that normally means you either didn't configure the logging correctly (you need to specify POP3:5, not POP:5 for example) or you couldn't make a TCP-IP connection to the mail server for some reason. For example, if you enabled IMAP logging and the connection to the AIM mail server was still open you would see something roughly like:Ġ: 2310cc0:imap.cs.com:NA:SetupWithUrl: clearing IMAP_CONNECTION_IS_OPEN It's much easier to debug a problem when you can also log it making a new connection. (The module nsHttp is not mentioned on the linked page.)Įxiting Thunderbird usually does not close any existing connections to a mail server, it can take 5-10 minutes for them to time out. Use log level 5, and remember to specify POP3:5, IMAP:5, SMTP:5, NNTP:5, nsHttp:5, MIME:5 or LDAP:5, depending on which type of server or protocol you are investigating. To create the log file, follow the instructions on the Mozilla web page linked below. You can log secure (SSL and TLS) connections.You do not see all the authentication information, so you might not be able to investigate authentication problems in detail.When you use Thunderbird to log a connection:

Thunderbird can create a log file for the server types POP3, IMAP, SMTP, NNTP and HTTP, and MIME and LDAP protocols.
