janharders - 10:57 pm on Mar 24, 2011 (gmt 0)
I suppose you don't have access to the mail-log to see what happened to the email? Can you access the mail-logs of the receiving mail-server to see wether it was contacted about the email and maybe rejected it?
Uhm. Shame on me, I haven't really been paying attention. I think the problem lies in your email that you submit to sendmail.
print SENDMAIL "Reply-to: me\@my.com\n";
print SENDMAIL "Send-to: you\@your.com\n";
Should, imho rather be
print SENDMAIL "From: me\@my.com\n";
print SENDMAIL "To: you\@your.com\n";
give that a try. If that does not work and you cannot access the logs, send me a private message and I'll give you an email address that you can test where I can check the log to see wether the sending server actually tried to contact the receiving server.