This class encapsulates a VRFY/RCPT based validity checker to transparently verify the existence of e-mail addresses. Instead of immediately sending the e-mail to the recipient SMTP server, an independent SMTP server is queried about the existence of the recipient e-mail address.

Instances of this class can be referred to in the recipient_matcher attribute of the SmtpProxy class. The SmtpProxy will automatically reject unknown recipients even if the recipient SMTP server would accept them.

Python:
class SmtpRecipientMatcherProxy(SmtpProxy):
recipient_matcher="SmtpCheckrecipient"
def config(self):
super(SmtpRecipientMatcherProxy, self).config()

MatcherPolicy(name="SmtpCheckrecipient", matcher=SmtpInvalidRecipientMatcher (server_port=25, cache_timeout=60, force_delivery_attempt=FALSE, server_name="recipientcheck.example.com"))