emal does not deliver

hi!
I have an email problem.
A customer tries to send an email from his account to an email, but the email returns to sender.
This is the error message he gets in the email:
> SMTP error from remote mailer after end of data:
> host mail6.itu.ch [156.106.192.22]: 553 5.7.1 Invalid header (phatvs)
I suspect that the email was wrongly rejected as spam. Do u think that this is the case?
Thanks in advance,
Mike emal does not deliver

 

 

 

 

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