This is the mail system at host mail.universalgroupbd.com.

I’m sorry to have to inform you that your message could not
be delivered to one or more recipients. It’s attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

               The mail system

sadeque.sharif@gmail.com: host gmail-smtp-in.l.google.com[108.177.125.27]
said: 550-5.7.1 [139.99.57.123 12] Our system has detected that this
message is 550-5.7.1 likely unsolicited mail. To reduce the amount of spam
sent to Gmail, 550-5.7.1 this message has been blocked. Please visit
550-5.7.1 Why has Gmail blocked my messages? - Gmail Help

support.google.com
Why has Gmail blocked my messages? - Gmail Help
Troubleshoot delivery issues with Postmaster Tools Gmail Postmaster Tools provides senders with metrics on parameters such as reputation, spam rate, feedback loop, etc. It can help you prevent your em
550
5.7.1 for more information.
c1-20020a630d01000000b004fb42dcc3b0si5188022pgl.710 - gsmtp (in reply to

end of DATA command

i am getting the above undelivery mail from gmail when i am trying to send mail to gmail.
my domain is mail.universalgroupbd.com. last weeks ago one of our email id was compromised and spam mail send to gmail, yahoo and hotmail from that account. after that when we identify the issue we disabled that account and delist from all blacklist site. but from that time we are unable to send the mail to gmail.

can anyone help us on that issue.

You have to contact Google about this. Not sure what you’re expecting us to do here.

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How can I contact them? is there any link to contact them?

I guess the quickest solution would be asking your hoster for a new IP address.

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