Hi there, Suddenly, my server is blocked sending an email via SMTP. Could you please help us on this issue asap? Our application cannot send email to the customer any more, it is an urgent issue. Please help us to fix it.
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Hi, my server cannot connect to smtp.gmail.com or sttp.office365.com (on remote port 587). I don’t understand why do we need to check the port 25. Many thanks for your reply.
It’s possible you’ve closed port 25. Can you please login to your server and run
netstat -tulpen | grep 25
Please provide us with the result here.
Additionally, please confirm what are you using to allow tcp/udp traffic, is it for example CSF or just plain Iptables?
Kind regards, Kalin D.
Hi, The problem is that Digital Ocean approved us sending email since 2017. SUDDENLY our servers are blocked without any explanation until we raised the issue. So disappointed with your service.
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