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Unexpected line breaks when sending XML attachments using ActionMailer

My application stores a large number of XML files. Background work periodically sends some of these XML files to a specific mailbox. The mailer code is simple:

class MailSender < ActionMailer::Base
    default :from => AppConfig.mail_from

    smtp_settings :address => AppConfig.smtp_host,
                  :username => AppConfig.smtp_user,
                  :password => AppConfig.smtp_pass

    def send_xml(record)
        f = record.filename.gsub("\\", "/") # converts \ to /
        f_short = arq.gsub(/.*\//, "") # extracts only the filename
        f_phys = "#{AppConfig.xml_root}#{arq}" # builds the physical filename

        headers["Return-Receipt-To"] = AppConfig.return_receipt

        attachments[f_short] = File.read(f_phys) if File.exists?(f_phys)

        mail :subject => "...",
             :to => AppConfig.mail_to
    end
end

However, for some reason, these XMLs are corrupted during transmission: the first line break is added in column 987, and the following are added in column 990. After each break, space is inserted. I think the picture speaks for itself:

col 1                                       col 990
|.................................................|
<?xml version="1.0"  ...  </IE><IM>321505493301<
 /IM><CNAE>4744001<  ...  00</pCOFINS><vCOFINS>0.00
 </vCOFINS></COFINS  ...  /prod><imposto><ICMS><ICM
 S40><orig>0</orig>  ...  <infAdic><infCpl>Permite

I tried calling File.readmyself on rails console, it works great, no line breaks are added. Therefore, I assume that the error should lie on ActionMailer. Any tips?

:. XML . , XML - , , .

+5
1

, "Thumbleweed":)

, :

attachments[f_short] = {
  :encoding => 'base64',
  :content => Base64.encode64( File.read(f_phys) ).chomp
} if File.exists?(f_phys)
+3

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