My mail server accepts AUTH only after STARTSSL and replies with 530 5.7.0 Must issue a STARTTLS command first otherwise. But this error message is ignored in sendCommand, which leads to the library happily continue sending the username and password over the wire in plaintext, which will be interpreted as commands, leading to: 502 5.5.2 Error: command not recognized.
My mail server accepts
AUTHonly afterSTARTSSLand replies with530 5.7.0 Must issue a STARTTLS command firstotherwise. But this error message is ignored insendCommand, which leads to the library happily continue sending the username and password over the wire in plaintext, which will be interpreted as commands, leading to:502 5.5.2 Error: command not recognized.