RFC821 say ... but my exim retrun always 550 against EXPN.
where is the fault ?
7.3 VRFY, EXPN, and Security As discussed in section 3.5, individual sites
may want to disable either or both of VRFY or EXPN for security reasons.
As a corollary to the above, implementations that permit this MUST NOT
appear to have verified addresses that are not, in fact, verified. If a site
disables these commands for security reasons, the SMTP server MUST
return a 252 response, rather than a code that could be confused with
successful or unsuccessful verification.
Leonardo Boselli
nucleo informatico e telematico
Dipartimento Ingegneria Civile
Universita` di Firenze
V. S. Marta 3 - I-50139 Firenze
tel +39()0554796431 fax +39()055495333
http://www.dicea.unifi.it/~leo
