Don't escape the @ in a single quoted string. You should either use:

bcc  => 'myaddress@xyz.com'

or

bcc   => "myaddress\@xyz.com"

For debugging things like this, I'd sugest having the program write out the mail being generated to a file, rather than pushing it to sendmail, and taking a look at it. If you want everything in the 'To' line, use the format:

to    => "ABCD <$emailaddress>, <myaddress\@xyz.com>"

I thought e-mail addresses format was explained in RFC822/RFC2822, or RFC821/RFC2821, but I'm not seeing it.

Update: the address specs were in RFC822 and RFC2822

In reply to Re: Mail not sending by jhourcle
in thread Mail not sending by lakeTrout

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