Closes all connections in the pool. If there is a message being sent, the connection is closed later
Placeholder function for creating proxy sockets. This method immediatelly returns without a socket
Returns true if there are free slots in the queue
Sends an e-mail using the selected settings
Verifies SMTP configuration
since v4.0.0
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Closes all connections in the pool. If there is a message being sent, the connection is closed later