email returned

Hi,
I have a server and some emails are denied by the recipient and I do not understand why.
I have a 7.2 centa server with 1.03
  The error is received below.
Says there is no email but there is.

Reverse dns is corectly, nameserver is corectly

Please help-me
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Reporting-MTA: dns; ns1.domain.ro
X-Postfix-Queue-ID: B7F252E1C5A
X-Postfix-Sender: rfc822; email@anotherdomain.ro
Arrival-Date: Fri,  5 May 2017 09:32:38 +0000 (UTC)

Final-Recipient: rfc822; office@daccomp.ro
Original-Recipient: rfc822;office@daccomp.ro
Action: delayed
Status: 4.4.1
Diagnostic-Code: X-Postfix; connect to mx01.whmpanels.com[89.42.222.102]:25:
    Connection timed out
Will-Retry-Until: Wed, 10 May 2017 09:32:38 +0000 (UTC)