Mail to wildcard MX records doesn't work from Yahoo Mail, but fine from other addresses
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From: Bob Eastbrook on 13 Apr 2010 03:16 I use wildcard MX records for mail, and a wildcard CNAME for web traffic. For example: *.example.com = MX record for mail.example.com *.example.com = CNAME myapp.appspot.com Email to bob(a)foo.example.com gets delivered to mail.example.com, and web traffic to http://foo.example.com goes to myapp.appspot.com. I use instructions from Wietse from a post I made on Dec 31, 2009: http://www.pubbs.net/200912/postfix/75444-virtual-domains-for-wildcard-mx-records.html. This works for all mailers I've found except for Yahoo Mail. Mail sent from Yahoo is rejected with: <bob(a)foo.example.com>: [ip.number.of.mailserver] does not like recipient. Remote host said: 554 5.7.1 <bob(a)myapp.appspot.com>: Relay access denied Giving up on [ip.number.of.mailserver]. At first glance, it appears that Yahoo Mail ignores the wildcard MX record and tries delivering to the CNAME. This is puzzling because my mail server also handles *.example.org in the same fashion as *.example.com, and example.org addresses work fine from Yahoo. Note that my mailserver is mail.example.com, not mail.example.org. Here's what I have for mydestination: mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain I run postfix 2.3.3 on CentOS 5.4. Any ideas? Bob
From: Bob Eastbrook on 13 Apr 2010 05:16 On Tue, Apr 13, 2010 at 1:01 AM, Simon Waters <simonw(a)zynet.net> wrote: > > Your post appears mangled beyond hope of direct assistance. Are you saying that the message was improperly formatted? >> Remote host said: 554 5.7.1 <bob(a)myapp.appspot.com>: Relay access denied > > This implies that your server rejected it. So where is the log from your > server? NOQUEUE: reject: RCPT from web81307.mail.mud.yahoo.com[68.142.199.123]: 554 5.7.1 <bob(a)myapp.appspot.com>: Relay access denied; from=<a-yahoo-user(a)yahoo.com> to=<bob(a)myapp.appspot.com> proto=SMTP helo=<web81307.mail.mud.yahoo.com> > The DNS config you give appears to be a case "CNAME and other" which is a > violation of RFC1034. So fix your DNS and see if things work correctly. Thanks for the pointer. I'll have to read up on this. I remain puzzled as to why the exact same DNS settings for example.org work just fine on mail.example.com. I suspect that if I had mail.example.org, then the server wouldn't work with Yahoo Mail addressed to bob(a)foo.example.org but would work with bob(a)foo.example.com. Bob
From: Bob Eastbrook on 14 Apr 2010 17:36
Summary: Thanks for all of the responses. I originally thought this was a Postfix issue, but now I see that I was doing something invalid in DNS. I'm surprised that my otherwise excellent nameserver provider allowed me to do this. |