Question: For some reason most of my messages are bouncing. Maybe my email provider have did some changes because I have not change any settings. Find a bounce sample bellow. Any idea how to solve this?
firstname.lastname@example.org: delivery temporarily suspended: conversation with 127.0.0.1[127.0.0.1] timed out while receiving the initial server greeting
Reporting-MTA: dns; xxxx.xxxx.xxxx.xxxx
X-Postfix-Sender: rfc822; email@example.com
Arrival-Date: Wed, 8 Nov 2017 01:47:52 +0100 (CET)
Final-Recipient: rfc822; firstname.lastname@example.org
Original-Recipient: rfc822; email@example.com
Diagnostic-Code: X-Postfix; delivery temporarily suspended: conversation with 127.0.0.1[127.0.0.1] timed out while receiving the initial server greeting
Answer: You get a 4.4.2 error.
The 4.4.2 error means the remote mail server (at yahoo.co.in) closed the SMTP connection from your mail server early. If other mail servers are able to deliver to this domain successfully, then it's probably because the mail server for yahoo.co.in thinks your mail server is sending spam. To see if your mail server has a problem that would cause other mail servers to think it's a spammer, try sending a message from your mail server to firstname.lastname@example.org. This service will do lots of checks, and you'll get a report back with valuable information, such whether or not your mail server's DNS is setup correctly, whether your mail server's IP is on any black lists, etc.
If that doesn't give you the solution, then I suppose you can ask an admin from your server to check the spam filter logs to see why his spam filter is shutting off the connection from your mail server. His logs should show this.
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