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Asked: 2016-03-24 03:31:59 +0800 CST

Mail from sendmail no longer delivered but SMTP does seem to work

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On Sendmail (debian) In my mail.log I get the usual

xdelay=00:00:00, mailer=relay, pri=120324, relay=foo.bar. [10.100.229.64], dsn=2.0.0, stat=Sent [..] [InternalId=43838731190661, Hostname=foo.bar] Queued mail for delivery)

however my colleagues that admin the Exchange server which I've configured as a relay 

define(`SMART_HOST',`foo.bar')

assure me that they are Not getting them on their server.

I also tried telnetting on foo.bar and send an email with the usual SMTP commands and that did work

How come sendmail is also reporting 2.0.0 was sent back from the server and yet email is not sent?

The only thing they say they've done is changed the internal DNS to have a redirect for anything .bar to their domain controllers, I dont know what that means but foo.bar resolves correctly on my server and as stated earlier SMTP commands over a telnet session on it worked.

linux

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