jodd-mail/src/main/java/jodd/mail/CommonEmail.java
public T headers(final Map<String, String> headersToSet) {
		headers.putAll(headersToSet);
		return _this();
	}
public T headers(final Map<String, String> headersToSet) {
		headers.putAll(headersToSet);
		return _this();
	}
Sets headers.

@param headersToSet Headers to set.
@return this