I'm having issues with my webhoster blocking automated emails from a client's website.  To solve this, I'm now routing outbound emails using authenticated smtp through the client's Xtra account (they use Xtra ADSL).  I'm using send.xtra.co.nz.

After setting the sender email account up, emails are now delivered fine.  I am noticing that Xtra filter out the Organisation email header, plus one other header I use for tracking.

Has anybody else noticed any anomalies with their smtp server?  I've set this up temporarily, however, if it proves to be rock solid I'll stick with it.

Any advice appreciated.