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Feb 1, 2013 at 16:07 comment added user22988 what i don't then understand is why it sometimes work and other times doesn't. i send the exact same message to 3 recipients on 3 occasions. Twice it goes through and then on the third one email will be bounced. It is like they have a threshold of returning 1 in every 9 emails of this type.
Feb 1, 2013 at 16:04 history edited Su' CC BY-SA 3.0
added 627 characters in body
Feb 1, 2013 at 16:01 comment added Su' My comment above was misdirected; I thought you were sending from GMail. At any rate, though, the error code is coming from their server. I found a bit more about the specific message you're getting(5.7.1); added above.
Feb 1, 2013 at 15:16 comment added user22988 The messages are all being sent to gmail users. They are not coming from gmail.
Feb 1, 2013 at 14:36 history answered Su' CC BY-SA 3.0