J.D. Falk wrote:
On Jul 20, 2010, at 8:09 AM, Hector Santos wrote:
It seem so random in what seems to be always accepting a transaction but
intermittently delivered or not.
Are you talking about the 4xx replies? If you check the text of the reply,
there's usually a URL with a bit more information about the reason. Same with
5xx, for that matter.
I have not seen temporary rejects. All transactions accepted with
250. However, it has been noted by others that YAHOO does employ
greylisting (in some form). But I have not seen the temporary
negative reply codes.
If you're saying the mail is just disappearing, it's possible that your users
have configured their accounts to delete suspected spam instead of putting it
in the spam folder.
The issue is that its intermittent and not consistent. Send a test,
with the recipient on the phone, he gets it. Send another test, i.e,
same message with "TEST #2" as subject, it never arrives. Send "Test
#3" it may or not arrive, and so on. No pattern.
However, at some point, we tried the reverse, yahoo to non-yahoo,
which arrived each time and then we try sending test messages again.
For a moment there, it appeared to work, so we presumed there was a
YAHOO user based "auto-white listing" to addresses the user sends mail
to. I jumped on this theory because we have that feature - local
users can build an auto-white list just by sending mail to to their
But then we try sending "test #4", "test #5" and so on and they done
ever arrive or go into any folder.
Absolutely, no pattern, inconsistent "DISCARDING" and delivery of mail.
I really hope someone with the yahoo story can explain it.
I was somewhat watching to see/hear if there was a related to valid
DKEY/DKIM Brownie points or something now expected by YAHOO. But all
I know so far about that is that is required by BULK mail senders. We
are not bulking here. just individual single shot messages.