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Asked: 2026-05-14T02:11:12+00:00

I would like to use Ruby Net::SMTP to send email. The routine send_message( msgstr,

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I would like to use Ruby Net::SMTP to send email. The routine

send_message( msgstr, from_addr, *to_addrs )

works well in my code for sending email, but it is not clear from this API how to send email to a list of people that need to be blind copied (bcc:).

Am I missing something, or is it just not possible with Net::SMTP?

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  1. Editorial Team

    The to_addrs parameter of send_message specifies the envelope to addresses. Including an address in to_addrs has no effect on the to and cc addresses that get included in the message header.

    To bcc a recipient, include the address in the to_addrs parameter, but don’t include it in the headers in msgstr. For example:

    msgstr = <<EOF
From: from@example.org
To: to@example.org
Cc: cc@example.org
Subject: Test BCC

This is a test message.
EOF

Net::SMTP.start(smtp_server, 25) do |smtp|
  smtp.send_message msgstr, 'from@example.org', 
    'to@example.org', 'cc@example.org', 'bcc@example.org'
end

    This will send an email to three recipients: to@example.org, cc@example.org and bcc@example.org. Only to@example.org and cc@example.org will be visible in the received message.

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