SPF fail?

hello

I have a forwarder on a@domain1.com that forward to a@domain2.com
the problem is that when I send a message from b@domain2.com to a@domain1.com , I get this error:


a@domain2.com
(generated from a@domain1.com)
SMTP error from remote mail server after RCPT TO:<a@domain2.com>:
host mx.domain2.com [200.154.55.2]: 550 <b@domain2.com>:
Sender address rejected: SPF fail - ns1.x.com[69.56.x.x] is not allowed to send mail with the domain domain2.com

but if I send a message FROM a different domain (like a@domain3.com), it goes well... so I guess the domain2.com is blocking the E-mails based on SPF
but how could I avoid that? any suggestions?!

thanks

 

 

 

 

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