Beware of vrfyon some mailers!

$ telnet/port=25 arizvm1.ccit.arizona.edu

Trying... Connected to ARIZVM1.CCIT.ARIZONA.EDU, an IBM 3090-300E running VM/XA.

220 ARIZVM1.ccit.arizona.edu running IBM VM SMTP V2R2 on Sun, 09 Oct 94 13:50:11 MST

vrfy foo

250 <foo@ARIZVM1.ccit.arizona.edu> via MAILER@ARIZVM1

vrfy blatz

250 <blatz@ARIZVM1.ccit.arizona.edu> via MAILER@ARIZVM1

vrfy thiscouldnotbearealusername

250 <thiscouldnotbearealusername@ARIZVM1.ccit.arizona.edu> via MAILER@ARIZVM1

vrfy taryn

250 <taryn@ARIZVM1.ccit.arizona.edu> via MAILER@ARIZVM1

quit

221 ARIZVM1.ccit.arizona.edu running IBM VM SMTP V2R2 closing connection

Connection closed by Foreign Host

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