jodd-mail/src/main/java/jodd/mail/EmailFilter.java
public EmailFilter subject(final String subject) {
		final SearchTerm subjectTerm = new SubjectTerm(subject);
		concat(subjectTerm);
		return this;
	}
public EmailFilter subject(final String subject) {
		final SearchTerm subjectTerm = new SubjectTerm(subject);
		concat(subjectTerm);
		return this;
	}
Defines filter for SUBJECT field.

@param subject The SUBJECT.
@return this