RE: Exchange 2010 and recipient verification
> -----Original Message-----Thank you Wietse,
> From: owner-postfix-users@... [mailto:owner-postfix-
> users@...] On Behalf Of Wietse Venema
> Sent: Thursday, August 29, 2013 12:37 PM
> To: Postfix users
> Subject: Re: Exchange 2010 and recipient verification
> Scappatura Rocco:
> > Aug 29 11:23:56 mailgw postfix/smtp: 6FF3AD5C79:
> relay=xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25, delay=0.03,
> delays=0.01/0.01/0.01/0.01, dsn=4.4.2, status=undeliverable (lost
> connection with xxx.yyy.www.zzz[xxx.yyy.www.zzz] while sending RCPT TO)
> > It seems that in the latter case Exchange fails to respond to the
> > SMTP commands MAIL and RCPT.
> > Could someone tell why this happens? How can I solve this? What
> > have to be done eventually on the downstream server side?
> This could be a feature where the Exchange drops connections from
> clients that send too much mail to non-existent recipients.
I will try to instruct the postmaster to configure Exchange so that sender 'double-bounce@...' is whitelisted.