Since changing to a new server customers domains are getting bounce backs on email

I have recently changed my server from Windows based Plesk mamnaged system to Linux based Plesk management system, since doing do a lot of my customers who use pop are getting bounce back emails from various clients they send to.

See below the error message.

This Message was undeliverable due to the following reason:

Your message was not delivered because the destination computer refused to accept it (the error message is reproduced below).  This type of error is usually due to a mis-configured account or mail delivery system on the destination computer; however, it could be caused by your message since some mail systems refuse messages with invalid header information, or if they are too large.

Your message was rejected by for the following reason:

     5.7.1 Sender ID (PRA) Not Permitted

The following recipients did not receive this message:

I think its something to do with the spf record in the dns settings for the domain.

Any ideas?
Daniel ForresterDirectorAsked:
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Jamie McKillopConnect With a Mentor IT ManagerCommented:
OK, you will need to contact your service provider and ask them to update your SPF record.

Duncan RoeSoftware DeveloperCommented:
Yes that looks plausible. RFC 4408 states that failure messages should come with the 5.7.1 Delivery Status Notification (DSN) code.
Have you checked the RFC? It may explain the problem.
The BIND 9 Administrator Reference Manual states that an SPF record
Contains the Sender Policy Framework information for a given email domain. Described in RFC 4408.
Jamie McKillopIT ManagerCommented:

You need to update your SPF record to include the IP or hostname of your new mail server. Do you manage your own DNS or does a service provider manage it for you?

Daniel ForresterDirectorAuthor Commented:
They manage that side of it.
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