jodd-mail/src/main/java/jodd/mail/EMLProperties.java
public T set(final String name, final String value) {
		checkSessionNotSet();
		properties.setProperty(name, value);
		return _this();
	}
public T set(final String name, final String value) {
		checkSessionNotSet();
		properties.setProperty(name, value);
		return _this();
	}
Sets property for the {@link Session}. If {@link Session} is already created, an exception
will be thrown.

@param name  Property name to set.
@param value Property value to set.
@return this
@throws MailException if the {@link Properties} has already been set.