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A user is using Windows 7 with Outlook 2010 SP2 and emails going through a Jerseymail POP3 setup.
He is receiving a bounce back as soon as he clicks send.
The following recipient(s) cannot be reached: 550 5.6.0 Content unacceptable.
This started a couple of days ago and not to all people he emails out to. Checking the content, there is nothing untoward.
I have had one occasion when I deleted the subject and typed it back in and the email sent, but I have not had this luck with others.
I seems like it is an Outlook issue as the Bounce backs are received very quickly. How could I solve this problem?
Great answer. The OP should also check the Outbox for failed messages which Outlook may be trying to resend. – CharlieRB – 2014-03-26T13:32:12.823
Thank you for the reply - I have already tried this, it will only send when I have deleted everything :). I would like to try copying the data to another email but unable to test this today. – user310663 – 2014-03-26T15:41:21.467