Dears,

My business has been affected too much, please help!

I was using Zabbix v 2.2.1 (monitoring tool) - It's by default doesn't support SMTP Auth., so I was forced to use an alternative SMTP server that Google provided (aspmx.l.google.com)
But due to some wrong configurations, a lot of emails have been sent out from my IP, and then it's stopped totally.

I checked the logs and got the below message:
30445:20140120:120805.880 wrong answer on end of data [550 5.7.1 html to review our Bulk Email Senders Guidelines. t26si977567yhl.130 - gsmtp
]

Any alternatives for free SMTP servers without Auth. or any solution for my case.

Awaiting your feedback ASAP.

Check if your ISP or host provides a relay you can use.

Alternatively check Googles Bulk Senders Guidelines and see if there's a way you can "appeal" the blacklisting.

1 members found this post helpful.

Thanks for the reply. But I didn't understand anything from the "Googles Bulk Senders Guidelines". Can you explain how I can get my domain unblocked.

https://support.google.com/mail/answer/81126?hl=en

https://support.google.com/mail/troubleshooter/2696779

Thanks! Any idea how long it will take to be resolved?

Haven't a clue!

I don't work for Google and have never had a server marked as a spammer.

You don't have to work for Google to know this
Many thanks for your support!

Yeah cause that would be a spammers dream.. that's what they usually do now, they find servers that are not secure to send their spam for them. No one should ever offer free SMTP without any authentication, that would just be absurd!