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SMTP Error message undeliverable email

I am receiving the below bounce back when sending an email from 1 email account on my domain; helpdesk@octree.co.uk, this only happens when sending to a handful of domains but it is a big problem as this is the email address we use for our support helpdesk.

Any help is greatly appreciated.

Your message did not reach some or all of the intended recipients.

Subject: [Ticket #25] Closed: Microsoft updates
Sent: 26/02/2009 10:18

The following recipient(s) could not be reached:

  richard.wilson@chasestead.co.uk on 26/02/2009 12:47
  There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
  <octree.co.uk #5.5.0 smtp;554 Failure tcp_read_dot 541 540 seconds, got 0 bytes (Err Code Zero after 540 seconds)>

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8/22/2022 - Mon