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Editorial Team
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Asked: 2026-06-17T05:18:45+00:00

I have this code: require net/smtp MAIL_SERVER = xxx.ad.xxx.net def lib_sending_report(email_hash) # define message

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I have this code:

require "net/smtp"

MAIL_SERVER = "xxx.ad.xxx.net"

def lib_sending_report(email_hash)

    # define message body

    message = <<"MESSAGE_END"

From: <#{email_hash[:sender]}>

To: <#{email_hash[:recipients]}>

MIME-Version: 1.0

Content-type: text/html

Subject: #{email_hash[:subject]}

<p>Hi All,</p>

    <p>We've just executed a round of load test.</p>

<p>Regards</p>
MESSAGE_END

    Net::SMTP.start(MAIL_SERVER) do |smtp|
      smtp.send_message message, email_hash[:sender], email_hash[:recipients]
    end
end

test = ""
lib_sending_report( {:sender => "abc@xxx.com",
                      :recipients => "abc@xxxx.com",
                      :subject => "Load.Test.Report.of.#{test}"} )

When I change :recipients => "abc@xxxx.com" to :recipients => "abc@xxxx.com;efg@xxx.com", it gives me this error:

 501 5.5.4 Invalid Address (Net::SMTPSyntaxError)

I can successfully send email when :recipients => "abc@xxxx.com" just have one recipient.

Where am I wrong? It seems that the separator(semicolon) I used is wrong.

I tried to use comma instead of semicolon, but it didn’t work

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1 Answer

  1. Editorial Team

    Net::SMTP’s send_message takes an array of “To:” address strings.

    Per the documentation:

    to_addr is a String or Strings or Array of Strings, representing the destination mail address or addresses.

    This example from the documentation shows how:

    Net::SMTP.start('smtp.example.com') do |smtp|
  smtp.send_message msgstr,
                    'from@example.com',
                    ['dest@example.com', 'dest2@example.com']
end
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