Remove the first Received header

[Joel Carnat]

Hi,

When using smtpd as a mail gateway and authenticating from various 
desktop/mobile clients, the first Received header always references the 
client host, ip, fqdn, etc. Some (maybe stupid) SMTP servers seem to 
consider these information when doing SPAM checks so you end getting 
blacklisted because the mail comes from a user IP-range and IP is not 
referenced in SPF...

Not sure it even makes sense and/or break SMTP RFCs but, is there a way 
to tell smtpd to not include that first "user connection" in the mail 
headers?

Thanks,
Joel