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[CaLViN]

Hello dears,
One of our customer started to see below gmail error :

Error: "550 5.7.1 [5.10.xx.xx 12] Our system has detected that this message is likely unsolicited mail. To reduce the amount of spam sent to Gmail, this message has been blocked. Please visit

http://support.google.com/mail/bin/answer.py?hl=en&answer=188131

for more information. z8si5698994oex.20 - gsmtp"


This is a very specific error as you know.This would be seen when there are high bounce rates but there is no changes on the email statistics.
Did any of you encounter this error suddenly ?

[jobeck]

CaLViN,

We've seen these when we send on behalf of a domain with a p=reject DMARC rule but we're not authorized to send as that domain. Both AOL and Yahoo just started publishing p=reject which caused our sends on behalf of these domains to bounce with the message you're seeing. We were also seeing equivalent bounces from other mailbox providers that check DMARC.

[CaLViN]

Hey jo,
The related domains doesnt have any dmarc record setup.

Thanks for the help.
This should be related to something else.

[MK2021]

Hey Calvin,

I have seen this error before. That is because of the domain you are using to send from or it the domain that is used in the body of your mail.

Just change and test it. It shud work!

Your domain would have been listed in blacklists. I think thats why it is blocked by gmail

Regards,

Kumar

[CaLViN]

Hey Kumar,
both sender domains and domains used in bodies are not in any blacklists.
This is very strange.

[MK2021]

Might be! But things are different in gmail.

One way to find it is, just put that domain in your personal gmail id and try sending it to another gmail id, if you receive a bounce message that means gmail has blocked your mail becoz of the domain.

Try if that helps

Regards

Kumar

[CaLViN]

Hey kumar,
It was successfully sent.
((

[MK2021]

It's strange Calvin!

Just curious to know what was the content used! If possible can you share it here, so that I will have a look at it.

[VIN786]

Yes I have seen this error too, last I researched, this was for a client and the list had auto-generated gmail email aliases - once the client removed those aliases the problem was resolved.

aliases were similar to john.smith@gmail.com, joh.nsmith@gmail.com, jo.h.n.smit.h@gmail.com and so on plus these were bad aliases so a hard bounce.

This may or may not be the case for your client.